1)The slot count messages are normal for our device.
2)Do you have the TWRP image in the same folder as your ADB terminal? If so, what's the TWRP image's full file name? Is it called twrp.img?
3)As I wrote in a previous post, where you've typed 'twrp.img', that filename must match the TWRP image's file name in your ADB folder, including extensions. For example, if your TWRP image is named shreps_3_1_1_TWRP.img then the full command would be
Code:
fastboot flash recovery shreps_3_1_1_TWRP.img
So you have to check if your TWRP image is called twrp.img. Also, if you turn on file extensions in Windows File Explorer, you can see if Windows has added any file extensions to your image (so it might actually be called twrp.img.img, which is different to twrp.img)
As I mentioned, you can type the first few characters of the exact TWRP file name and press Tab on your keyboard to have the system complete the filename for you. Bear in mind it'll only autocomplete if you have the file in the same folder, so it knows what name to add. For example, you could type 'fastboot flash recovery shr' and then after typing shr press Tab, which should fill the rest in for you.
EDIT - shouldn't be a problem to have 2 folders with the same function. Ensure you've copied the twrp.img to your minimal ADB folder then. Unless you provide a file path, the ADB terminal will look in the folder it's residing in, which would be the minimal ADB folder if you're using the minimal ADB terminal.