[Xperia Z1 Compact General] zxz0O0:
The customization number can be useful to correctly specify the branding when making FTF files with Flashtool, to identify FTF files if the branding has not been (correctly) specified by the uploader and to download a different firmware customization with Sony PC Companion.

The list is sorted by customization number. Look up customization numbers or country easily by pressing Ctrl-F (Windows/Linux) or Command-F (Mac).

Thanks Apollo89 for the info and pcpepik for the image

Xperia Z1 Compact D5503

laguCool developed a tool called XperiFirm, it includes the full list:

http://xdaforums.com/crossdevice-dev/sony/pc-xperifirm-xperia-firmware-downloader-t2834142

Unknown Unknown 1278-8474

Unknown Unknown 1279-2030
Italy Generic 1279-2796 1279-5059.5 (black)
Unknown Unknown 1279-3507
Unknown Unknown 1279-3509
Russia Generic 1279-3901
Unknown Unknown 1279-4053
Unknown Unknown 1279-4108
Unknown Unknown 1279-4123
Norway/Sweden/Denmark Customized NCB 1279-4149 1279-5047.3 (black), 1279-5048.3 (white), 1279-5334.5 (lime)
Estonia Generic 1279-4151 1280-7603.3 (lime)
Unknown Unknown 1279-4153
Unknown Unknown 1279-4401
Unknown Unknown 1279-4548
Unknown Unknown 1279-4552
United Kingdom o2 1279-4558
United Kingdom Generic 1279-4727 1279-7253 (white), 1279-5053.3 (white), 1279-5054.3 (black), 1281-0110.3 (lime)
Unknown Unknown 1279-4730
Unknown Unknown 1279-4744
Unknown Unknown 1279-5188
Italy Wind 1279-5204 1279-5062 (black)
Unknown Unknown 1279-5359
Unknown Unknown 1279-5361
Saudi Arabia Generic 1279-5363 1279-7249.3 (black)
France / Australia(?) Generic 1279-5365 1279-7252.3 (black), 1279-7253.3 (white)
Philippines/Taiwan Generic 1279-6212 1279-4843.4 (white)
Switzerland/Austria Generic 1279-6976 1279-6238.4 (white), 1280-2927.4 (black)
Germany Generic 1279-6978 1279-3718.4 (white), 1280-3659.4 (black)
Unknown Unknown 1279-7219
Unknown Unknown 1279-7234
Unknown Unknown 1279-7236
France Generic 1279-7243
Unknown Unknown 1279-7532
Unknown Unknown 1279-7541
Unknown Unknown 1279-7579

Unknown Unknown 1280-0067
Unknown Unknown 1280-0069
Unknown Unknown 1280-0071
Unknown Unknown 1280-0073
Unknown Unknown 1280-0078
Mexico Generic 1280-0080 1281-1308.4 (black)
Greece Generic 1280-1394 1280-1798.3 (pink), 1280-1799.3 (white)
Unknown Unknown 1280-1403
Israel Generic 1280-2387 1280-1806.3 (black)
Spain Generic 1280-2812
Unknown Unknown 1280-2818
Switzerland Swisscom 1280-2820 1280-2171.4 (black)
Switzerland Generic 1280-2822 1280-2925.4 (black)
South Africa Vodacom 1280-3124 1280-2980.3 (black)
France SFR 1280-3148 1279-7984.4 (black)
Unknown Unknown 1280-3230
Unknown Unknown 1280-3464
Croatia T-Mobile 1280-5444 1280-8725.3 (black)
Hungary Telekom HU 1280-5446 1282-1474.2 (black)
Unknown Unknown 1280-5456
Unknown Unknown 1280-6754
Unknown Unknown 1280-7847
Unknown Unknown 1280-7850
Unknown Unknown 1280-7853
Unknown Unknown 1280-7855
Unknown Unknown 1280-7858
Czechia / Slovakia Generic 1280-7864 1280-7982.4 (lime), 1280-7983.4 (white), 1280-7984.4 (black)
Unknown Unknown 1280-7866
Hungary/Bosnia/Serbia Generic 1280-7868 1280-7985.3 (black)
Unknown Unknown 1280-7870
Unknown Unknown 1280-7872
Unknown Unknown 1280-7876
Unknown Unknown 1280-8234
Unknown Unknown 1280-8249
Turkey Generic 1280-8251
Unknown Unknown 1280-8254
Unknown Unknown 1280-8258
Bulgaria Generic 1280-8260 1284-2439.2 (black)
Unknown Unknown 1280-8262
Unknown Unknown 1280-9080
Unknown Unknown 1280-9797

Indonesia Generic 1281-0156 1280-7510.5 (white), 1280-7562.5 (lime), 1280-7333.5 (black)
Malaysia/Philippines Generic 1281-0182 1820-8503.5 (black), 1280-8509.5 (black), 1280-8511.5 (lime), 1280-8512.5 (pink)
Singapore Generic 1281-0182 ^ same as above
India Generic 1281-0184 1280-5348.4 (black), 1280-5349.4 (white)
Australia Telstra Australia 1281-1039 1281-1657.4 (white), 1281-1655.4 (black)
Unknown Unknown 1281-2668
Australia Generic 1281-3422 1281-0380.4 (black)
Unknown Unknown 1281-3719
Unknown Unknown 1281-3723
Unknown Unknown 1281-7006
Unknown Unknown 1281-8240
Hong Kong / Taiwan Generic 1281-9266 1286-3947.4 (black)

Unknown Unknown 1282-0526
Unknown Unknown 1282-0538
Unknown Unknown 1282-1305
Unknown Unknown 1282-1306
Unknown Unknown 1282-3533
Germany Vodafone 1282-3535 1285-4393.2 (black)

CE = Central Europe

NCB = Nordic combined branding

How to download any firmware

Follow this guide by Apollo89: http://xdaforums.com/showthread.php?t=2334653

How to check for new version

Use this link and add the customization number at the end: http://fuas.sonymobile.com/fuas/ser...updateFormat=delta,image&channel=cable&cdfId=