The Innosilicon A5+ 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:
update_180622.bin
8E465A38CA5C3AF6C80C12E4D50A422B
a5+_20190417_044506(beta).swu
278F3682A57BE01D4E3BCAB11578130B