Avoid random Torrents. Go to trusted sources:
Verify checksums (MD5/SHA256) against the forum post. huawei b535-232 custom firmware
Rarely, custom firmware changes the IMEI or SIM detection logic. Your router might reject a valid SIM after flashing. Fix by re-flashing the modem partition with a stock modem_fw.bin. Avoid random Torrents
Instead of full replacement firmware, the community uses modified stock firmware and configuration unlocks. These are not true custom firmware but achieve similar goals. Verify checksums (MD5/SHA256) against the forum post
After testing four different custom firmware builds on two B535-232 routers (Rev1 and Rev2), here is the final take:
Custom firmware is not for everyone. The B535-232 is particularly risky because: