These are the easiest to flash thingino on:
https://github.com/themactep/thingino-firmware/wiki/Installation:-No-Tool-Methods
Some require actual soldering, some just require you to connect using a usb cable and use a cloning tool. The usb cloning tool is available for both linux and windows:
https://github.com/themactep/thingino-firmware/wiki/Installation:-General#installation-methods
https://github.com/themactep/thingino-firmware/wiki/Ingenic-USB-Cloner