Huawei learned from the E5186 days. On the B535:
If you want better performance without the risk of custom firmware, consider these "soft" mods: huawei b535-232 custom firmware
Gain full access to AT commands , which allow for manual band locking and IMEI modification. Huawei learned from the E5186 days
dd if=/dev/mtdblock0 of=/tmp/mtd0_backup.bin removal of ISP restrictions)
The Huawei B535-232 is a 4G LTE router popular for home and small-office use. Installing custom firmware can unlock advanced features (e.g., VLANs, traffic shaping, advanced QoS, OpenVPN, removal of ISP restrictions), but it also carries risks: bricking the device, voiding warranty, losing cellular/band compatibility, or introducing security issues. Proceed only if you understand those risks and have a recovery plan.