In the past, tools like "MFC" or "Unlock Tool" could rewrite NV items. However, the iPhone 7 utilizes a security architecture where the Baseband EEPROM is locked after manufacturing.
If you are a technician or an advanced DIY user, these are the current market leaders. Disclaimer: Use these only for legally owned devices. iphone 7 imei repair tool
If the Baseband CPU is physically damaged, a technician can replace it. In the past, tools like "MFC" or "Unlock
Note: This is a legal gray area. Some tools allow you to write a different IMEI to the phone. This is illegal in most countries (USA, EU, UK) because IMEI cloning is a felony under the Wireless Telephone Protection Act. However, legitimate repair shops use this to "re-pair" a repaired baseband to a new IMEIChip. If you are a technician or an advanced