PW4 find old firmware wher fr wintebreak? after i need to updte manualy & rejb partial jb

[supon]

i somehow deleted some important files in my previously jbed PW4 on firmware 5.12.4 now inside the root of kindle and other files there is huge (4gb/5gbish) gibberish files without any way to delete those files in any way (tried android and windows too) , so thoguht gonna reset and update to a stable firmaware like 5.15.x or somethign and then install new jailbreak of that "Winterbreak"


but after some digging into the mobileread forum i saw that as i have corrupted file systemn and corruopted kual with corrupted "Renamed OTA binary" i need to first manually update my kindle to that target firmware and then reset the kindle and then use the winterbreak so please suggest me what is wrong