To upgrade the firmware of a WTOS based unit we are using the same folder structure already explained in Q1.
Copy the firmware file (UTC_b512 for WT1200LE, TWA_WNOS for WT1125, RCA_wnos for S10, VL10_wnos for V10L and C10_wnos for C10LE).
Additionally you need a new parameter in your wnos.ini. This is called "autoload=1" or "autoload=2". The first will allow up- and downgrades whereas the latter only allows upgrades. It is recommended to allow only upgrades. To bypass any login windows you should also add "SignOn=no" in a new line of your wnos.ini.