Would like to restore my old flash backup

i would like to restore my old backup files (below files), which i created while converting CEX to DEX.

1. flash_eEID_35500.bin
2. flash_stor_35500.bin
3. lv1_dump_35500.bin
4. lv2_dump_35500.bin

i converted back to DEX to CEX but getting invalid PS3ID error while connecting to PSN. i am suspecting the restore might not done properly during flashing (my-original-cex.EID0.NORBIN)

i basically want to restore my ole lv2 backup, suspecting this issue might resolve after restoring.

please guide me the way to restore my old backup without using any hard mod.