Or, even better, don't buy a Kindle in the first place but get something that doesn't need a jailbreak, like for instance literally any Kobo reader.
Had a few kobos, very good readers, then bought a Box color go 7 ii, mainly because it runs android, so you can used it for so many things. Shame the company is based in china.
But why? You can get a Kindle with ads, jailbreak it and having Bezos pay the halb of your Device
+1 for Kobo.
I've had my Kobo Clara HD for almost 8 years and I still use it daily with KOReader. It's so easy to install KOReader and it's really repairable. I replaced the SD card at one point, and another time I thought it was broken or needed a new battery but came back to life after reseating cables.
Before that I had a kindle and you had to jump through a lot of hoops to install KOreader, and I remember you had to be careful not to upgrade the firmware so it could be jailbroken.
Like I said I've had the Kobo for 8 years, so I hope this is still the case.