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How to fix Update Error Signal 4 while installing LineageOS?
The most common reasons for LineageOS Error 4 are as follows:
1. Try to install the latest version of TWRP recovery on your device You can download the latest version from the official TWRP Recovery website.
2. You are trying to install a build for a different device. You need to make sure you download the zip for the correct device *and* variant.
3. Now you need to flash the migration zip, marked as ‘experimental.’ This is necessary as you are attempting to migrate from an unofficial build to LineageOS.
4. Your vendor/modem/bootloader is too old (or maybe too new). Flash the correct stock image for your device, before wiping data and attempting to install LineageOS again. This information should be listed on the device’s wiki page.
So these are the three significant errors of TWRP Error Signal 4 problems; if you tried all the steps and still it is not fixed, then I prefer you to factory reset your device.
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The Conclusion
That’s all! Follow the guide to get rid of Error Signal 4 while installing the LineageOS ROM. Now, if you’re using any alternate method do enlighten the methods in the comment section. Also, tell us what methods you use to install GAPPS packages on your device. For any queries or suggestions, leave a comment below.