Subject: ZTE MU5001 Firmware Update – Step-by-Step Instructions, Troubleshooting & Best Practices

A: Every 4–6 months or when you experience bugs/security alerts. Check ZTE’s support site quarterly.

A: No. The SIM card storage is unaffected. Only device settings may reset.

A: Usually yes via recovery mode, but ZTE sometimes blocks downgrades (anti-rollback). Check community forums.