Systemarm32aonlyimgxz — Extra Quality

The correct term is .img.xz.

XZ compression reduces OTA package sizes dramatically. For example, a 2 GB system image may compress to under 600 MB.

How to extract .img.xz:

xz -d system.img.xz

After extraction, you can mount or flash the .img file.

.img: A raw disk image file.

.xz: A high-compression archive format (LZMA2). The file is compressed and must be decompressed before use.

In file‑sharing and modding communities, “extra quality” often tags: systemarm32aonlyimgxz extra quality

Legitimate firmware updates do not use “extra quality” as a version descriptor.

The term likely derives from:

Thus, systemarm32 might refer to an Android system image built for 32‑bit ARM processors.