how do i flash a custom ROM

[AC Question]

i asked about removing a white sim card and the answer was to flash a custom ROM i don't know how or what it is

 

[belodion]

Please join as a member - you'll be welcome - so that you can continue to post in your original thread. Joining is easy.

https://forums.androidcentral.com/showthread.php?t=409154

 

[B. Diddy]

Welcome to Android Central! Which phone? What do you mean by removing a white SIM card? You can physically remove the SIM card. Are you asking how to carrier-unlock a phone?

 

[belodion]

If it is a symbol in the status bar at the top of the screen, perhaps it means that there is trouble of some sort with your SIM card, or your microSD card.