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Tethered wireless shooting with TP-Link router

Hi....

I've been following the instructable about wireless tethering using the TP-Link MR3040 portable router

(https://www.instructables.com/id/Wireless-tethered-shooting-with-any-DSLR-camera-V3/)

This is great and works very well. My problem is that the router in the instructable is now obsolete in the UK so I was wondering if anyone knows if the TP-Link MR3020 can be flashed with the same firmware? If not are there any other compatible portable routers on the market.

I understand the firmware is based upon the OpenWRT firmware but that the author has added some additional scripts, if I can't find a suitable replacement router does anyone know what additional scrips have been added and if it's possible to add them to the OpenWRT 3020 firmware.

Many thanks for any help.