CC, it can be independently replaced, but it’s a part of the back cover. In the 4a 5G, in order to access the back cover, you need to remove the screen, as seen in our guide here.
Once you have the rear cover removed, the flash, mic, and sensor need to be removed. You can see that assembly in this step. The lens cover is then adhered to the back cover.
If you source a replacement cover, you may want to find one with pre-applied adhesive, otherwise water resistance will almost certainly be lost.
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