Question about upgrading the firmware on W810i

[hyperion17]

Thanks, but I pretty much gathered what the latest firmware is, but I don't know what you meant by if you want to keep the brand you should use a branded MAIN, not a "generic" one? Care to elaborate? Thanks.

I thought you have a branded firmware, like Orange, or Vodafone. But you have a generic MAIN and EUROPE2 FS, which means it's not branded. The network elements(theme, startup image, shutdown image) are given by the customization of the FS with the custom file:
W810i_CDA102494_145_R3A_o2_(PrePay)_United_Kingdom