/diy/ - Do It Yourself

Hi there.
I've got an ender 3 pro with a v4.2.2 board and v1.0.1 firmware. Is this thing a fire hazard if I don't upgrade the firmware? I can find plenty of information on how to upgrade my firmware, but none on how to tell if I have a safe machine.
Second, IM FICKING DONE WITH PTFE TUBES. I've gotten 5 clogs from the tube in my printer and I just need an all metal hot end that fits on an ender 3, are there any cheaper chinese knockoffs on ebay that will suit my needs ok? I've been looking at this one specifically (https://www.ebay.com/itm/304244746703?_trkparms=amclksrc%3DITM%26aid%3D777008%26algo%3DPERSONAL.TOPIC%26ao%3D1%26asc%3D20220705100511%26meid%3D883c9ae8c0964558abe411cb60781f06%26pid%3D101524%26rk%3D1%26rkt%3D1%26itm%3D304244746703%26pmt%3D1%26noa%3D1%26pg%3D2380057%26algv%3DRecentlyViewedItemsV2&_trksid=p2380057.c101524.m146925&_trkparms=pageci%3A87120881-f863-11ed-9539-1ec1e7db57c5%7Cparentrq%3A41fb959a1880a9f54ccb466bfffd6efe%7Ciid%3A1)) but I'm not sure if it has an all metal hot end, and i'm not even fully sure that it's compatible with my printer.
Any advice helps.