If your baseband is intact but the IMEI is simply "Invalid," you might be able to restore it without flashing:
Find the original IMEI numbers printed on the back of the phone or on the original retail box. These 15-digit numbers will be needed if you need to rewrite them after restoring the NVRAM partition. The Vivo Y83 has two IMEI numbers (IMEI1 and IMEI2) because it supports dual SIM dual standby.
If your phone still boots, back up any personal data, as this process can wipe the device. Step-by-Step Guide to Fix Vivo Y83 NVRAM vivo y83 nvram file fix
Turn off your phone and connect it to the PC.
If you do not have a personal NVRAM backup, you can download a generic NVRAM file designed specifically for the Vivo Y83 PD1803BF. These files contain standard placeholder IMEI numbers (usually 123456789012345 or similar), which you must then replace with your original IMEI using a separate rewriting tool. If your baseband is intact but the IMEI
Use the search bar to locate and select from the model directory. Step 2: Write NVRAM Data
No. Writing a new NVRAM file or rewriting IMEI numbers targets only the NVRAM partition, which stores configuration data, not user files. However, performing a full stock ROM flash (Method 5) will erase everything on the phone, so back up your data beforehand. If your phone still boots, back up any
Uncheck all partition boxes in the checklist grid except for and NVDATA . Step 3: Load the Fix Files and Flash
Once booted, dial *#06# on the phone dialer to verify that your IMEI numbers have been restored. Alternative Method: Engineering Mode
A factory reset can sometimes restore default NVRAM values if the partition is not physically damaged. Important Safety Warnings
A green checkmark window saying "Download OK" will pop up once the file is successfully written. Disconnect your phone and power it on.