A few days ago I add LC to my file. Flashed file and run car. Like every time everthing pass good. LC working as schould, car runs as schould.  After that i was using my car continusly, without problems till tonight. I park my car, and later try to start it but without luck. The VCDS show this
16985 - Internal Control Module
            P0601 - 008 - Memory Check Sum Error

I flash again with nefmoto same file, start the engine and contionue to use car.

ME7Check v1.12 (c) mki, 06/2004-05/2012
Checking file E:\8E0909518AH\MOD\30.10.2019(LC)\BEX_190_k03_02DELETE_82Cv2.4_SUM.bin (size=1048576)
Reading Version Strings...
-> Bootrom Version = 06.02
-> EPK = 40/1/ME7.5/5/4016.32//24E/Dst02o/180902//
-> Contents of ECUID data table:
   - '0261207941'         (SSECUHN)        
   - '1037366871'         (SSECUSN)        
   - '8E0909518AH '       (VAG part number)
   - '0002'               (VAG sw number)  
   - '1.8L R4/5VT    '    (engine id)      
-> Contents of ECUID data table:
   - 'HW_MAN004'                            


-> No errors found. File is OK.   *********************



What could cause this? I have no idea what can cause thism usuly when file is not OK the ECu brick itself after second start, then i need to use boot mode. But not in this case, i started car at least 15-20 time since file uploaded

1) no I use snook method with little help of LC script
2) decompile checksum routine? First time I heard about this, but thank you for point me that, I will dig in forum more
3) a little, but looks like not enought

I will do more read, try to solve problem and come back here with report/solution

You can still tell us what it was...