--- a/build/moz.configure/android-ndk.configure
+++ b/build/moz.configure/android-ndk.configure
@@ -15,17 +15,17 @@ option('--with-android-googlevr-sdk', na
        help='location of the Android GoogleVR SDK')
 
 
 @depends(target)
 def min_android_version(target):
     if target.cpu in ['aarch64', 'x86_64', 'mips64']:
         # 64-bit support was added in API 21.
         return '21'
-    return '16'
+    return '9'
 
 
 js_option('--with-android-version',
           nargs=1,
           help='android platform version',
           default=min_android_version)
 
 

--- a/mobile/android/config/mozconfigs/android-x86/debug
+++ b/mobile/android/config/mozconfigs/android-x86/debug
@@ -4,17 +4,17 @@
 ac_add_options --enable-debug
 
 # Android
 # Warning: Before increasing the with-android-min-sdk value, please note several places in and out
 # of tree have to be changed. Otherwise, places like Treeherder or archive.mozilla.org will
 # advertise a bad API level. This may confuse people. As an example, please look at bug 1384482.
 # If you think you can't handle the whole set of changes, please reach out to the Release
 # Engineering team.
-ac_add_options --target=i686-linux-android
+ac_add_options --target=i386-linux-android
 ac_add_options --with-android-min-sdk=16
 
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
 export MOZ_ANDROID_POCKET=1
 
 ac_add_options --with-branding=mobile/android/branding/nightly
 

--- a/mobile/android/config/mozconfigs/android-x86/nightly
+++ b/mobile/android/config/mozconfigs/android-x86/nightly
@@ -1,16 +1,16 @@
 . "$topsrcdir/mobile/android/config/mozconfigs/common"
 
 # Warning: Before increasing the with-android-min-sdk value, please note several places in and out
 # of tree have to be changed. Otherwise, places like Treeherder or archive.mozilla.org will
 # advertise a bad API level. This may confuse people. As an example, please look at bug 1384482.
 # If you think you can't handle the whole set of changes, please reach out to the Release
 # Engineering team.
-ac_add_options --target=i686-linux-android
+ac_add_options --target=i386-linux-android
 ac_add_options --with-android-min-sdk=16
 
 ac_add_options --with-branding=mobile/android/branding/nightly
 
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
 export MOZ_ANDROID_POCKET=1
 

--- a/python/mozboot/mozboot/android.py
+++ b/python/mozboot/mozboot/android.py
@@ -9,17 +9,17 @@ import errno
 import os
 import stat
 import subprocess
 import sys
 
 # We need the NDK version in multiple different places, and it's inconvenient
 # to pass down the NDK version to all relevant places, so we have this global
 # variable.
-NDK_VERSION = 'r17b'
+NDK_VERSION = 'r15c'
 
 ANDROID_NDK_EXISTS = '''
 Looks like you have the Android NDK installed at:
 %s
 '''
 
 ANDROID_SDK_EXISTS = '''
 Looks like you have the Android SDK installed at: