Kobo Glo Multitouch

Hi

I just got a hand-me down Kobo Glo that I would like to use to read scanned pdfs. It would be sooo much better if it would pinch /zoom etc. Firmware is 4.13.12638. I found a few old pages on patching the Glo with much older firmware.

So..
Is this possible with recent firmware?

Can firmware be downgraded to a much older version that had patches for multitouch?

Should i just forget about it.

BTW I am a seasoned Linux user just not sure what my options are.

TIA
Glenn