The progress bar at the bottom will flash yellow, indicating data transfer.
By default, SP Flash Tool checks all boxes. Uncheck everything except NVRAM (and NVDATA if available).
Dialing *#06# displays "Null", "Unknown", or "00000000000000".
If you are downloading this file:
Never download random NVRAM files from untrusted sources. Using another device’s NVRAM will copy that device’s IMEI, which is illegal in most countries (IMEI cloning). It will also cause RF calibration mismatches, leading to poor signal or battery drain.
The unique international identifiers for your cellular slots.