Lenovo Smart Tab M8

TB-8505XS "With Google Assistant and SmartDock"

Not to be confused with Lenovo Smart Tab M8 FHD although the same installation procedure applies

A-only, but takes A/B roms due to system-as-root

Full 64 bit armv8

Steps to install

• Recommended: Download the stock ROM, using for example the official tool (registration required); in which case it will be stored in \ProgramData\LMSA\Download\RomFiles\\*\.
• Unlock the bootloader:

  # after enabling unlocking in developer settings...
  fastboot flashing unlock
  # press volume+
  

• flash this image with the fastboot utility:

  fastboot flash --disable-verification --disable-verity vbmeta RomFiles\TB_8505XS_S300088_201220_BMP\vbmeta.img
  fastboot flash system system-roar-arm64-ab-vanilla.img
  fastboot erase userdata
  fastboot reboot
  

Hardware support

PHH AOSP 11.0 v300.m:

⚠️ Will bootloop if secure boot (enabled by agreeing to it while configuring a protected lockscreen) is not enabled

Component	Comment
MicroSD	Working
WiFi	Working (802.11ac 5GHz)
Bluetooth	Working (search, OBEX)
Camera	Working (AOSP camera, photo & video)
Speakers	Working
Mic	Working (stereo sound unverified)
SIM / Mobile Data / Voice	Untested (IMEI detected)
VoLTE	Untested (is it even supported?)
Wired headphones	Working
Wired remote/mic	Untested
ADB	Working
MTP	Working
OTG	Working
Dock + OTG	Working
Offline Charging	Broken (freezes on unlocked bootloader warning)
Root	Working (PHH Superuser)
First boot	< 3 minutes

PHH AOSP 11.0 v306:

as above

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Tested By: Ryccardo (@rboninsegna) - TB-8505XS ZA5D0038SE (Swedish model sold in Italy), official firmware TB_8505XS_S300088_201220_BMP - 2021.5.12