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 [guide|140448|here].
Once you have the rear cover removed, the flash, mic, and sensor need to be removed. You can see that assembly in [guide|140448|this step|stepid=280139]. 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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