MHI2 Downgrade

Hi mates! I'm trying to downgrade MIB2 Harman form MHI2_ER_AUG22_K3344 to MHI2_ER_AUG22_K2156.
Flashed backup of 2156 to RCC, MMX, APP.img What elese i have to recover? Now unis starts, but no MAIN MENU, no diag, and i cant start FW update, because of error metainfo.txt signature. Seems like IOC have to be recovered too, please, help how to flash V850. Thanks!

Is the car A5 ?
Also did you flashed system partion too, also IOC.
If you flashed only RCC and MMX w/o IOC then it will not work this way.
IOC need to be in sync with RCC at least.

The car is A4 B9, what do you mean "system partition"? I recovered full images of RCC and MMX, flashed APP.IMG to the NAND partition. I know that IOC (V850) must fit RCC, but i don't know how to flash it :(
Or another way, i'd like to BUY A SOLUTION for FEC signature ignore for my FW (MHI2_ER_AUG22_K3344).

Solved. mib2 ioc flash