[Q] How-to flash radio with S-Off
I'm running CM 11 nightlies on a S-Off HTC One S with hboot 2.15.
I would like to upgrade the radio, because I have no 3G data connection atm.
Most guides which I found are for the case of having no S-Off, i.e. S-On.
My best guess therefore is just to flash firmware.zip using fastboot.
However, I am unsure how to get the radio only from the latest OTA's. Inside there is the firmware.zip (in ROM.zip), which has much more than only radio.img. As far as I understand the how-to's, it is not possible to directly flash radio.img, but flashing a zip with fastboot is possible (I also tried flashing the radio.img directly, fastboot gives me 'not allowed' as expected).
The firmware.zip from the OTA is correctly packaged (it has a android.txt or so and is signed). Can I extract the radio.img, put it in a firmware.zip with the extra android file and sign it myself somehow?
Much thanks for your time!