So I've fucked up recovery on my phone, I should add it works completely fine right now.

Previously I've rooted it and installed TeamWin onto it. One day last year, Android was bugging me to update. I clicked yes and didn't realise it won't update because I've rooted and installed TeamWinReceoveryProject (TWRP). So the update failed and I thought nothing of it.

So the other day I wanted to make a backup of my phone and tried to get into TWRP only I go into fastboot now and when I select recovery it just reboots. Anyway I can fix this so I have TWRP back?