Upgrade Huawei E303 Firmware to 21.157.31.00.850

[natural]

Using the "Universal Master code software" to generate flash codes based on the IMEI Retro Bowl is a key step. This is the tool needed to "bypass" the protection of the custom firmware. Do you think modem manufacturers should provide an easier unlocking process for end users, or is "network locking" necessary to protect the business model of service providers?