QTS 4.3.6.1070 or older
TS-131P, TS-231P, TS-231+, TS-431P, TS-431+
TS-531P
TS-231P2, TS-431P2
TS-431U
TS-431X, TS-431X2, TS-531X, TS-831X
TS-431XU, TS-431XeU, TS-431XU-RP, TS-831XU, TS-1231XU-RP, TS-1231XU, TS-1231XU-RP
TS-432XU, TS-832X, TS-832XU
TS-1635
QBoat Sunny
When updating the NAS firmware to QTS 4.4.1 or later, you receive a Failed to update system. A flash read/write error occurred. Error code: FW004 error. It may also refer to a corrupted file or an unsupported firmware update. It may give a QNAP firmware update error at 30% as it is trying to update the kernel. You need an intermdiate update installed first to remedy this.
To resolve this issue, you’ll need to update the NAS firmware to a specific version before you can update to the current firmware.
A full table of files is available on this page on the QNAP Website regarding error when updating QNAP firmware. Click the link (underlined text) to the left.