[SOLVED]
Summary of steps
Determine Intel Management Engine Version (HWinfo64 works well)
Download the matching Intel ME tools (section C):
Intel Management Engine: Drivers, Firmware & System Tools
Run the Flash Programming Tool (FPTw.exe or FPTw64.exe) inside the Flash Programming Tool folder, inside that a Windows or Win/Win32 folder, select that Win folder, hold shift and press right click, choose open command window here (not power shell). If no option to run cmd, run cmd as administrator and navigate to the directory (cd C:*directory tree containing FPTw.exe)
At the command prompt run the following command >> FPTw.exe -bios -d biosreg.bin (this will dump current bios image)
Import biosreg.bin into UEFItool (must be an older version, the newer version disables the “replace body” function.
To modify the splash screen search for GUID address that contains the splash screen images. For Lenovo M82, these images are stored as .raw files in the following GUID addresses:
4D3D82AE-2C3A-4C14-99BD-D59644EF6BC0
6C9013D0-4059-4723-AF2A-05E63FFECF19
83762026-D2AC-4A48-999C-D392C851A6C6
Extract the .raw files (right click, extract body in UEFItool) and save them.
Open the .raw in paint and edit the image. Make the image fit in the existing space/resolution. Save your new file and make sure it saves as a .raw file.
You may notice that the original .raw file and your edited .raw file are two different sizes (in my case my edited .raw file was smaller).
Using a hex editor, you can add empty space to your edited .raw file as "00"s. An easy way to do this is open up both the original and modded .raw files in a hex editor. Copy any addition "00"s from the original .raw and add them to the edited .raw to make them the same size. Save and verify the edited files are the same size as the original. (I’m not 100% sure this step is necessary, but i recommend it).
In UEFItool, navigate to the GUIDs and replace the .raw files with the edited ones (right click, replace body and select your edited files)
Save your modified bios modbiosreg.bin
Attempt to flash the modified bios using FPT by following command
>>FPTw.exe -bios -f modbiosreg.bin
If write protected, the bypass trick works for the Lenovo M82. Put the computer to sleep (sleep state 3) for 1 minute. Wake the computer and immediately flash in FPT with the same command:
>>FPTw.exe -bios -f modbiosreg.bin
The flash should suceed