diff --git a/adb/commandline.c b/adb/commandline.c
index 23722b6..cf02545 100644
--- a/adb/commandline.c
+++ b/adb/commandline.c
@@ -43,6 +43,7 @@
 int find_sync_dirs(const char *srcarg,
         char **android_srcdir_out, char **data_srcdir_out, char **vendor_srcdir_out);
 int install_app(transport_type transport, char* serial, int argc, char** argv);
+int install_multiple_app(transport_type transport, char* serial, int argc, char** argv);
 int uninstall_app(transport_type transport, char* serial, int argc, char** argv);
 
 static const char *gProductOutPath = NULL;
@@ -151,13 +152,15 @@
         "                               - remove a specific reversed socket connection\n"
         "  adb reverse --remove-all     - remove all reversed socket connections from device\n"
         "  adb jdwp                     - list PIDs of processes hosting a JDWP transport\n"
-        "  adb install [-l] [-r] [-d] [-s] [--algo <algorithm name> --key <hex-encoded key> --iv <hex-encoded iv>] <file>\n"
+        "  adb install [-lrtsd] <file>\n"
+        "  adb install-multiple [-lrtsdp] <file...>\n"
         "                               - push this package file to the device and install it\n"
-        "                                 ('-l' means forward-lock the app)\n"
-        "                                 ('-r' means reinstall the app, keeping its data)\n"
-        "                                 ('-d' means allow version code downgrade)\n"
-        "                                 ('-s' means install on SD card instead of internal storage)\n"
-        "                                 ('--algo', '--key', and '--iv' mean the file is encrypted already)\n"
+        "                                 (-l: forward lock application)\n"
+        "                                 (-r: replace existing application)\n"
+        "                                 (-t: allow test packages)\n"
+        "                                 (-s: install application on sdcard)\n"
+        "                                 (-d: allow version code downgrade)\n"
+        "                                 (-p: partial application install)\n"
         "  adb uninstall [-k] <package> - remove this app package from the device\n"
         "                                 ('-k' means keep the data and cache directories)\n"
         "  adb bugreport                - return all information from the device\n"
@@ -280,6 +283,24 @@
     }
 }
 
+static void read_status_line(int fd, char* buf, size_t count)
+{
+    count--;
+    while (count > 0) {
+        int len = adb_read(fd, buf, count);
+        if (len == 0) {
+            break;
+        } else if (len < 0) {
+            if (errno == EINTR) continue;
+            break;
+        }
+
+        buf += len;
+        count -= len;
+    }
+    *buf = '\0';
+}
+
 static void copy_to_file(int inFd, int outFd) {
     const size_t BUFSIZE = 32 * 1024;
     char* buf = (char*) malloc(BUFSIZE);
@@ -1576,7 +1597,7 @@
         parse_push_pull_args(&argv[1], argc - 1, &lpath, &rpath, &show_progress, &copy_attrs);
 
         if ((lpath != NULL) && (rpath != NULL)) {
-            return do_sync_push(lpath, rpath, 0 /* no verify APK */, show_progress);
+            return do_sync_push(lpath, rpath, show_progress);
         }
 
         return usage();
@@ -1596,12 +1617,17 @@
         return usage();
     }
 
-    if(!strcmp(argv[0], "install")) {
+    if (!strcmp(argv[0], "install")) {
         if (argc < 2) return usage();
         return install_app(ttype, serial, argc, argv);
     }
 
-    if(!strcmp(argv[0], "uninstall")) {
+    if (!strcmp(argv[0], "install-multiple")) {
+        if (argc < 2) return usage();
+        return install_multiple_app(ttype, serial, argc, argv);
+    }
+
+    if (!strcmp(argv[0], "uninstall")) {
         if (argc < 2) return usage();
         return uninstall_app(ttype, serial, argc, argv);
     }
@@ -1856,117 +1882,186 @@
     }
 }
 
-static int check_file(const char* filename)
-{
-    struct stat st;
-
-    if (filename == NULL) {
-        return 0;
-    }
-
-    if (stat(filename, &st) != 0) {
-        fprintf(stderr, "can't find '%s' to install\n", filename);
-        return 1;
-    }
-
-    if (!S_ISREG(st.st_mode)) {
-        fprintf(stderr, "can't install '%s' because it's not a file\n", filename);
-        return 1;
-    }
-
-    return 0;
-}
-
 int install_app(transport_type transport, char* serial, int argc, char** argv)
 {
     static const char *const DATA_DEST = "/data/local/tmp/%s";
     static const char *const SD_DEST = "/sdcard/tmp/%s";
     const char* where = DATA_DEST;
-    char apk_dest[PATH_MAX];
-    char verification_dest[PATH_MAX];
-    char* apk_file;
-    char* verification_file = NULL;
-    int file_arg = -1;
-    int err;
     int i;
-    int verify_apk = 1;
+    struct stat sb;
 
     for (i = 1; i < argc; i++) {
-        if (*argv[i] != '-') {
-            file_arg = i;
-            break;
-        } else if (!strcmp(argv[i], "-i")) {
-            // Skip the installer package name.
-            i++;
-        } else if (!strcmp(argv[i], "-s")) {
+        if (!strcmp(argv[i], "-s")) {
             where = SD_DEST;
-        } else if (!strcmp(argv[i], "--algo")) {
-            verify_apk = 0;
-            i++;
-        } else if (!strcmp(argv[i], "--iv")) {
-            verify_apk = 0;
-            i++;
-        } else if (!strcmp(argv[i], "--key")) {
-            verify_apk = 0;
-            i++;
-        } else if (!strcmp(argv[i], "--abi")) {
-            i++;
         }
     }
 
-    if (file_arg < 0) {
-        fprintf(stderr, "can't find filename in arguments\n");
-        return 1;
-    } else if (file_arg + 2 < argc) {
-        fprintf(stderr, "too many files specified; only takes APK file and verifier file\n");
-        return 1;
+    // Find last APK argument.
+    // All other arguments passed through verbatim.
+    int last_apk = -1;
+    for (i = argc - 1; i >= 0; i--) {
+        char* file = argv[i];
+        char* dot = strrchr(file, '.');
+        if (dot && !strcasecmp(dot, ".apk")) {
+            if (stat(file, &sb) == -1 || !S_ISREG(sb.st_mode)) {
+                fprintf(stderr, "Invalid APK file: %s\n", file);
+                return -1;
+            }
+
+            last_apk = i;
+            break;
+        }
     }
 
-    apk_file = argv[file_arg];
-
-    if (file_arg != argc - 1) {
-        verification_file = argv[file_arg + 1];
+    if (last_apk == -1) {
+        fprintf(stderr, "Missing APK file\n");
+        return -1;
     }
 
-    if (check_file(apk_file) || check_file(verification_file)) {
-        return 1;
-    }
-
+    char* apk_file = argv[last_apk];
+    char apk_dest[PATH_MAX];
     snprintf(apk_dest, sizeof apk_dest, where, get_basename(apk_file));
-    if (verification_file != NULL) {
-        snprintf(verification_dest, sizeof(verification_dest), where, get_basename(verification_file));
-
-        if (!strcmp(apk_dest, verification_dest)) {
-            fprintf(stderr, "APK and verification file can't have the same name\n");
-            return 1;
-        }
-    }
-
-    err = do_sync_push(apk_file, apk_dest, verify_apk, 0 /* no show progress */);
+    int err = do_sync_push(apk_file, apk_dest, 0 /* no show progress */);
     if (err) {
         goto cleanup_apk;
     } else {
-        argv[file_arg] = apk_dest; /* destination name, not source location */
-    }
-
-    if (verification_file != NULL) {
-        err = do_sync_push(verification_file, verification_dest, 0 /* no verify APK */,
-                           0 /* no show progress */);
-        if (err) {
-            goto cleanup_apk;
-        } else {
-            argv[file_arg + 1] = verification_dest; /* destination name, not source location */
-        }
+        argv[last_apk] = apk_dest; /* destination name, not source location */
     }
 
     pm_command(transport, serial, argc, argv);
 
 cleanup_apk:
-    if (verification_file != NULL) {
-        delete_file(transport, serial, verification_dest);
+    delete_file(transport, serial, apk_dest);
+    return err;
+}
+
+int install_multiple_app(transport_type transport, char* serial, int argc, char** argv)
+{
+    char buf[1024];
+    int i;
+    struct stat sb;
+    unsigned long long total_size = 0;
+
+    // Find all APK arguments starting at end.
+    // All other arguments passed through verbatim.
+    int first_apk = -1;
+    for (i = argc - 1; i >= 0; i--) {
+        char* file = argv[i];
+        char* dot = strrchr(file, '.');
+        if (dot && !strcasecmp(dot, ".apk")) {
+            if (stat(file, &sb) == -1 || !S_ISREG(sb.st_mode)) {
+                fprintf(stderr, "Invalid APK file: %s\n", file);
+                return -1;
+            }
+
+            total_size += sb.st_size;
+            first_apk = i;
+        } else {
+            break;
+        }
     }
 
-    delete_file(transport, serial, apk_dest);
+    if (first_apk == -1) {
+        fprintf(stderr, "Missing APK file\n");
+        return 1;
+    }
 
-    return err;
+    snprintf(buf, sizeof(buf), "exec:pm install-create -S %lld", total_size);
+    for (i = 1; i < first_apk; i++) {
+        char *quoted = escape_arg(argv[i]);
+        strncat(buf, " ", sizeof(buf) - 1);
+        strncat(buf, quoted, sizeof(buf) - 1);
+        free(quoted);
+    }
+
+    // Create install session
+    int fd = adb_connect(buf);
+    if (fd < 0) {
+        fprintf(stderr, "Connect error for create: %s\n", adb_error());
+        return -1;
+    }
+    read_status_line(fd, buf, sizeof(buf));
+    adb_close(fd);
+
+    int session_id = -1;
+    if (!strncmp("Success", buf, 7)) {
+        char* start = strrchr(buf, '[');
+        char* end = strrchr(buf, ']');
+        if (start && end) {
+            *end = '\0';
+            session_id = strtol(start + 1, NULL, 10);
+        }
+    }
+    if (session_id < 0) {
+        fprintf(stderr, "Failed to create session\n");
+        fprintf(stderr, buf);
+        return -1;
+    }
+
+    // Valid session, now stream the APKs
+    int success = 1;
+    for (i = first_apk; i < argc; i++) {
+        char* file = argv[i];
+        if (stat(file, &sb) == -1) {
+            fprintf(stderr, "Failed to stat %s\n", file);
+            success = 0;
+            goto finalize_session;
+        }
+
+        snprintf(buf, sizeof(buf), "exec:pm install-write -S %lld %d %d_%s -",
+                sb.st_size, session_id, i, get_basename(file));
+
+        int localFd = adb_open(file, O_RDONLY);
+        if (localFd < 0) {
+            fprintf(stderr, "Failed to open %s: %s\n", file, adb_error());
+            success = 0;
+            goto finalize_session;
+        }
+
+        int remoteFd = adb_connect(buf);
+        if (remoteFd < 0) {
+            fprintf(stderr, "Connect error for write: %s\n", adb_error());
+            adb_close(localFd);
+            success = 0;
+            goto finalize_session;
+        }
+
+        copy_to_file(localFd, remoteFd);
+        read_status_line(remoteFd, buf, sizeof(buf));
+
+        adb_close(localFd);
+        adb_close(remoteFd);
+
+        if (strncmp("Success", buf, 7)) {
+            fprintf(stderr, "Failed to write %s\n", file);
+            fprintf(stderr, buf);
+            success = 0;
+            goto finalize_session;
+        }
+    }
+
+finalize_session:
+    // Commit session if we streamed everything okay; otherwise destroy
+    if (success) {
+        snprintf(buf, sizeof(buf), "exec:pm install-commit %d", session_id);
+    } else {
+        snprintf(buf, sizeof(buf), "exec:pm install-destroy %d", session_id);
+    }
+
+    fd = adb_connect(buf);
+    if (fd < 0) {
+        fprintf(stderr, "Connect error for finalize: %s\n", adb_error());
+        return -1;
+    }
+    read_status_line(fd, buf, sizeof(buf));
+    adb_close(fd);
+
+    if (!strncmp("Success", buf, 7)) {
+        fprintf(stderr, buf);
+        return 0;
+    } else {
+        fprintf(stderr, "Failed to finalize session\n");
+        fprintf(stderr, buf);
+        return -1;
+    }
 }
diff --git a/adb/file_sync_client.c b/adb/file_sync_client.c
index c1ab808..ad59e81 100644
--- a/adb/file_sync_client.c
+++ b/adb/file_sync_client.c
@@ -335,7 +335,7 @@
 #endif
 
 static int sync_send(int fd, const char *lpath, const char *rpath,
-                     unsigned mtime, mode_t mode, int verifyApk, int show_progress)
+                     unsigned mtime, mode_t mode, int show_progress)
 {
     syncmsg msg;
     int len, r;
@@ -350,63 +350,6 @@
     snprintf(tmp, sizeof(tmp), ",%d", mode);
     r = strlen(tmp);
 
-    if (verifyApk) {
-        int lfd;
-        zipfile_t zip;
-        zipentry_t entry;
-        int amt;
-
-        // if we are transferring an APK file, then sanity check to make sure
-        // we have a real zip file that contains an AndroidManifest.xml
-        // this requires that we read the entire file into memory.
-        lfd = adb_open(lpath, O_RDONLY);
-        if(lfd < 0) {
-            fprintf(stderr,"cannot open '%s': %s\n", lpath, strerror(errno));
-            return -1;
-        }
-
-        size = adb_lseek(lfd, 0, SEEK_END);
-        if (size == -1 || -1 == adb_lseek(lfd, 0, SEEK_SET)) {
-            fprintf(stderr, "error seeking in file '%s'\n", lpath);
-            adb_close(lfd);
-            return 1;
-        }
-
-        file_buffer = (char *)malloc(size);
-        if (file_buffer == NULL) {
-            fprintf(stderr, "could not allocate buffer for '%s'\n",
-                    lpath);
-            adb_close(lfd);
-            return 1;
-        }
-        amt = adb_read(lfd, file_buffer, size);
-        if (amt != size) {
-            fprintf(stderr, "error reading from file: '%s'\n", lpath);
-            adb_close(lfd);
-            free(file_buffer);
-            return 1;
-        }
-
-        adb_close(lfd);
-
-        zip = init_zipfile(file_buffer, size);
-        if (zip == NULL) {
-            fprintf(stderr, "file '%s' is not a valid zip file\n",
-                    lpath);
-            free(file_buffer);
-            return 1;
-        }
-
-        entry = lookup_zipentry(zip, "AndroidManifest.xml");
-        release_zipfile(zip);
-        if (entry == NULL) {
-            fprintf(stderr, "file '%s' does not contain AndroidManifest.xml\n",
-                    lpath);
-            free(file_buffer);
-            return 1;
-        }
-    }
-
     msg.req.id = ID_SEND;
     msg.req.namelen = htoll(len + r);
 
@@ -789,7 +732,7 @@
         if(ci->flag == 0) {
             fprintf(stderr,"%spush: %s -> %s\n", listonly ? "would " : "", ci->src, ci->dst);
             if(!listonly &&
-               sync_send(fd, ci->src, ci->dst, ci->time, ci->mode, 0 /* no verify APK */,
+               sync_send(fd, ci->src, ci->dst, ci->time, ci->mode,
                          0 /* no show progress */)) {
                 return 1;
             }
@@ -808,7 +751,7 @@
 }
 
 
-int do_sync_push(const char *lpath, const char *rpath, int verifyApk, int show_progress)
+int do_sync_push(const char *lpath, const char *rpath, int show_progress)
 {
     struct stat st;
     unsigned mode;
@@ -855,7 +798,7 @@
             rpath = tmp;
         }
         BEGIN();
-        if(sync_send(fd, lpath, rpath, st.st_mtime, st.st_mode, verifyApk, show_progress)) {
+        if(sync_send(fd, lpath, rpath, st.st_mtime, st.st_mode, show_progress)) {
             return 1;
         } else {
             END();
diff --git a/adb/file_sync_service.h b/adb/file_sync_service.h
index 8ea239e..5dd2e80 100644
--- a/adb/file_sync_service.h
+++ b/adb/file_sync_service.h
@@ -78,7 +78,7 @@
 
 void file_sync_service(int fd, void *cookie);
 int do_sync_ls(const char *path);
-int do_sync_push(const char *lpath, const char *rpath, int verifyApk, int show_progress);
+int do_sync_push(const char *lpath, const char *rpath, int show_progress);
 int do_sync_sync(const char *lpath, const char *rpath, int listonly);
 int do_sync_pull(const char *rpath, const char *lpath, int show_progress, int pullTime);
 
diff --git a/adb/services.c b/adb/services.c
index e48e460..bff935c 100644
--- a/adb/services.c
+++ b/adb/services.c
@@ -283,9 +283,10 @@
         adb_close(sv[0]);
         init_subproc_child();
 
-        // Only hook up stdin/stdout; drop stderr
         dup2(sv[1], STDIN_FILENO);
         dup2(sv[1], STDOUT_FILENO);
+        dup2(sv[1], STDERR_FILENO);
+
         adb_close(sv[1]);
 
         execl(cmd, cmd, arg0, arg1, NULL);