i have an older a2h124-48 Switch with Firmware 02.01.01.x .
I tried to update these to 03.03.06.01 - allways with the result:
TFTP code transfer starting
Verifying CRC of file in Flash File System
Error: File failed CRC check!
Same results with Xmodem or via Netsight Inventory Manager.
So i try different Firmwares - and only 02.01.05.0001 was accepted by the A2 with Xmodem transfer.
Update Boot Code in Boot Menu didn't help.