XPERIA XZ1 has model number G8441 in all markets but Japan DoCoMo, where it is known under SO-02K. The internal product name is "lilac". There are three product variants:
| build_product | sw_variant | Model | Description |
| lilac | GLOBAL-LTE4A | G8441 | All unlocked and carrier-branded devices, except in US/Japan |
| lilac_docomo | DOCOMO-LTECA | SO-02K | Japan DoCoMo branded devices. |
| lilac_us_ss | USSS-LTE4A | G8441 | Unlocked US devices. |
Additionally, there are 43 G8441 customization versions and 1 SO-02K. You can see your customization version by dialing *#*#7378423#*#*, then going to 'Service info', 'Software info' and 'Customization Version' will have actual number (something like 1310-4371_R8B). XPERIA Companion checks this customization version and will query the server for updates for that specific version.
I analyzed firmware for various versions and decided to share the results. The values below are taken from /system/build.prop and /system/etc/prop.default. Build time is selected as the latest one of ro.build.date and ro.bootimage.build.date. Table is ordered by Build time.
| Firmware Versions | Android Version | Security Patch | Built | Notes |
| 47.1.A.2.281 | 8.0.0 | 2017-08-05 | Thu Aug 17 09:06:24 JST 2017 | Original firmware |
| 47.1.A.2.324 | 8.0.0 | 2017-08-05 | Tue Sep 5 03:53:17 JST 2017 | |
| 47.1.A.2.374 | 8.0.0 | 2017-10-01 | Fri Sep 29 04:06:03 JST 2017 | |
| 47.1.A.5.51 | 8.0.0 | 2017-11-01 | Fri Oct 27 12:54:34 JST 2017 | |
| 47.1.A.7.1 | 8.0.0 | 2017-11-01 | Mon Nov 13 14:01:34 JST 2017 | |
| 47.1.B.5.5 | 8.0.0 | 2017-11-01 | Tue Dec 5 03:44:41 JST 2017 | DoCoMo-only |
| 47.1.A.8.49 | 8.0.0 | 2017-12-01 | Thu Dec 7 04:00:27 JST 2017 | |
| 47.1.A.12.34 | 8.0.0 | 2018-01-01 | Fri Dec 22 04:20:36 JST 2017 | |
| 47.1.B.6.36 | 8.0.0 | 2018-01-01 | Tue Dec 26 02:53:20 JST 2017 | DoCoMo-only |
| 47.1.A.12.75 | 8.0.0 | 2018-02-01 | Thu Jan 25 04:22:21 JST 2018 | |
| 47.1.A.12.119 | 8.0.0 | 2018-03-01 | Thu Feb 22 19:44:35 JST 2018 | Latest for lilac_us_ss |
This is for reference only.
