Failing to prepare properly can "brick" your router (render it permanently unusable). Before downloading or flashing any software, complete this checklist:
This guide shows how to update the firmware/software on a HUAWEI HG255s ADSL gateway/router. Updating firmware can fix bugs, improve stability or add features. Proceed only if you have a firmware file from a trusted source (your ISP or Huawei). Incorrect firmware or an interrupted update can permanently damage the device. Update Software in HUAWEI HG255s