It is the bios compatible issue. The issue does not have to downgrade firmware back to 1.52, and only bios code needs to be downgraded. The old firmware packages can be found in our ftp site, and you just need to update the BIOS.BIN from older firmware package.
ftp://ftp.areca.com.tw/RaidCards/BIOS_Firmware/
Tags: ARC-1882ix, BIOS, firmware