Today I finally managed to upload a new bootloader/softdevice to a watch! It wasn't easy because bootloader that is originally installed on weloop does not allow to upload a new softdevice or bootloader. There's also no support in softdevice to run command on device start (using MBR) that will copy part of firmware from one place to another (it was added in 7.1.0 softdevice and is required to change bootloader or softdevice). So the biggest issues were:

• no bootloader/sofdevice upload feature in original bootloader
• no way to use a newer bootloader code because it requires features that are not available in S110 6.0.0 softdevice.
• UICR cannot be updated! That's the biggest issue because there is a value 0x14000 set at 0x10001000 address so there's no way to use newer softdevice with this value there. There's also 0x38000 set at 0x10001014 and I wanted to make bootloader smaller and use 0x3C000 as a start address.

So how I manage to do this? I will describe it tomorrow because it's time to go sleep ;) If you want to check it yourself take a look at THIS CODE. A compiled firmware that replaces bootloader/softdevice can be found HERE. But be careful with it, it can brick your watch!

So from now on my weloop can connect directly to other devices without a mobile phone! Now's time to write an awesome firmware ;)