Firmware big big problems

where can i download the latest firmware for my ender 3 v2 printer with a 4.2.2 motherboard most sites i go to are blocked also what is this dwin that some of the web pages refer to and finally how do you use the firmware and dwin to install it
as in my previous post this all went wrong when i changed my hot end , complete with heater and thermostor as you have probably guessed i am totally ignorant of all this techy stuff so would really appreciate HELP regards bob

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hi Michel580 thank you for your reply im sorry but the trouble seems to be a lot worse than i thought now when i switch on the machine the hot end starts heating up and continues to do so until the thermal cuts out and i have no idea why i have replaced the hot end a complete unit with everything attached and still no success is there anything you can think of that would cause this i am desperate thanks and kind regards bob