Bricked my device, any advice?

Last week, I tried to root my device. I flashed SuperSU V2.65 (which I thought would root my phone), only I ended up in a bootloop.



My friend suggested a factory reset, so I did that, and now I boot to a black screen, it doesn't even finish the boot animation.



I did some research online, and discovered that I could use an RUU to fix my phone only there were loads of them, and I'm not sure which to use.



When I boot to the bootloader, I see this:

*** TAMPERED ***

*** UNLOCKED ***

M7_UL PVT SHIP S-ON RH

HBOOT-1.61.0000

RADIO-4T.35.3218.16

OpenDSP-v35.120.274.0718

OS-7.19.401.2

eMMC-boot 2048MB



I live in England, and use a tesco mobile phone, which works on the O2 network. I have a few questions:



Is an RUU the best way to fix my phone?

I have a radio/baseband number (as shown in the image), is it important that this matches the RUU I am using, should I pick an RUU based on that?

If I use an RUU that is not my current version (I was using lollipop) can I reupgrade to lollipop?



Thank you for your help.

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