The Innosilicon A8+ miner has two kinds of firmware, and the two cannot be upgraded with each other.
Firmware download link:
https://www.innosilicon.com/html/support_en/download.html
Please select the corresponding firmware according to the following figure:
A8_plus_update20180511_1548.bin
58DF47386EE2BEFABAD27B64D90EF8E3
a8+_20190403_034116.swu
C520C0D2A120345A3EF0D1DD409CF198