2019 Shield tv Pro stuck in boot loop

Bought 2019 pro shield tv with Lineage installed but decided to go back to stock. I downloaded the stock recovery rom from NV and set everything up. Inside the recovery bundle is a bat file. Usually I would flash all files manually but this time I used the bat file. It manged the first 3 or 4 commands then came up with error. The box is now stuck in a boot loop and I am unable to access over adb.
Can you please suggest a way around this.
Thanks

Here is the bat file

fastboot flash staging blob
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash system system.img
fastboot flash vendor vendor.img
fastboot flash dtb mdarcy.dtb.img
fastboot flash vbmeta vbmeta.img
fastboot oem lock (optional step: required for certain functionality)
fastboot reboot

Do you know that if I purchased a wired game controller I would be able to access fastboot? Recovary mode. Is this possible through wired keyboard. If so which buttons do I press for recovery mode.
Thanks

EDIT: I eventually managed to sort this out. I used a usb hub which had USB drive that contained backup and an install lineage.zip file on it. A wired keyboard was also connected to the hub and laptop connected to other USB rear port.

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