These are paid repositories where specific carrier-unlocked or "engineering" firmwares are often listed. Why People Look for Custom Firmware
Here are some links to resources where users can find and download custom firmware for the Huawei B535-232: huawei b535232 custom firmware link
Finding custom firmware for the is difficult because Huawei uses proprietary HiSilicon chipsets that lack upstream Linux support, making official OpenWrt or similar standard custom builds largely unavailable . However, community-led "modded" firmwares exist that add features like bridge mode, TTL mangling, and band selection. Key Resources for Custom/Modded Firmware huawei b535232 custom firmware link