There maybe some more branches to track.

[HegeKen]

I've been using MiFlash Pro(English) to get fastboot rom the other day, and I noticed some roms are not the typical branches as we know.

mx_tc
mx_at
cl_en
lm_cr
za_vc

I found some information in Mi Community for :
MIUI 10 Beta MX-TC Stable V10.3.9.0.PCOMXTC for Redmi Note 8 Released
MIUI 10 Beta LM-CR Stable V10.3.20.0.PCOLMCR for Redmi Note 8 Released

links are below:
https://bigota.d.miui.com/V11.0.7.0.QGGMXTC/miui_BEGONIAMXTCGlobal_V11.0.7.0.QGGMXTC_c831ab5612_10.0.zip
https://bigota.d.miui.com/V11.0.7.0.QGGMXTC/begonia_mx_tc_global_images_V11.0.7.0.QGGMXTC_20211018.0000.00_10.0_global_dc9b6ae4ae.tgz
https://bigota.d.miui.com/V13.0.4.0.SKFMXAT/miui_SWEETMXATGlobal_V13.0.4.0.SKFMXAT_982d7d7405_12.0.zip
https://bigota.d.miui.com/V13.0.4.0.SKFMXAT/sweet_mx_at_global_images_V13.0.4.0.SKFMXAT_20220904.0000.00_12.0_global_dc7b726646.tgz
https://bigota.d.miui.com/V13.0.3.0.SKFCLEN/miui_SWEETCLENGlobal_V13.0.3.0.SKFCLEN_02a6bad928_12.0.zip
https://bigota.d.miui.com/V13.0.3.0.SKFCLEN/sweet_cl_en_global_images_V13.0.3.0.SKFCLEN_20221108.0000.00_12.0_global_ff6bdaca05.tgz
https://bigota.d.miui.com/V12.0.4.0.RKFLMCR/miui_SWEETLMCRGlobal_V12.0.4.0.RKFLMCR_6d13b6751f_11.0.zip
https://bigota.d.miui.com/V12.0.4.0.RKFLMCR/sweet_lm_cr_global_images_V12.0.4.0.RKFLMCR_20210805.0000.00_11.0_global_b02f880a0c.tgz
https://bigota.d.miui.com/V13.0.4.0.SKFZAVC/miui_SWEETZAVCGlobal_V13.0.4.0.SKFZAVC_8c44e4bf91_12.0.zip
https://bigota.d.miui.com/V13.0.4.0.SKFZAVC/sweet_za_vc_global_images_V13.0.4.0.SKFZAVC_20221021.0000.00_12.0_global_24d6fd400d.tgz

[HegeKen]

links are samples, there is more, device list below:
cepheus
tucana
courbet
lancelot
dandelion
begonia
sweet
selene

[yshalsager]

Thanks for the suggestion! We know some of them already, but it will take some time to add these regional carrier ROMs, mostly with the new website version.

[HegeKen]

Thanks for the suggestion! We know some of them already, but it will take some time to add these regional carrier ROMs, mostly with the new website version.

thanks for all your reply and hard work, wish you all good luck and happy life.