I've always flashed my OrangePi RK3399 using Linux (rkdeveloptool) and never actually done it using Windows. However, I did fiddle around with it and noted that in order to change to english, open the file config.ini in the same folder as AndroidTool.exe, and change:
I've been able to boot a mainline kernel with a barely working DTS file that can, still, boot up to X11 and provide a working serial console.
USB is "just broken" though, since the DTS file doesn't follow the schematics at all.
https://gitlab.com/snippets/1792126
Note that I'm currently using an external MMC file for the moment, since it's the easiest way for me. Replacing broken kernels on the eMMC is a pain, I can't get Gadget mode working with the DesignWare DWC3 connector on U-Boot at the moment (I just tried to enable the option, though, not tinker with the DTB and such...).
So my only way to test and replace kernels quickly is to use a Micro SDCard to boot the system on the OrangePi, and use an USB MicroSD reader on my main PC to replace broken kernels/DTB files.
So, tomorrow will be : Schematics to DTS time... Yay...