2 out of 7 boards having avrdude: verification error

Im using ATMEGA2560v-8AU with 16Mhz external crystal.

2 out of 7 boards im produced having the error below: (5 boards working perfectly)

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0064
0xe4 != 0xf4
avrdude: verification error; content mismatch

Please help.

ATMEGA2560v-8AU is a processor not a board. Should we assume this is a custom board?

If so I would suspect board faults on the 2 boards you cannot program.

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