NEW Good Cheap Flasher OBD/Software Flasher

Hello, I know before now Shitstorm comes or other things…… The last post has been a long time since 2018 and we have already 2025 …… I’m looking like the name says a good Flasher that has access to both the new cars and old cars. It’s not meant to be a commercial one, it’s not called a thousand Euro Flasher, but for the time and again if you want to code/change something. The Flasher should be able to handle all the brands as well as old/new cars and give full access. It can also be a Kess V2 clone, I had heard that the one from Russia should be the best. Now I ask people who know a little bit about it here as well. My goal is to read out the engine control unit to make e.g. games such as AGR OFF , Drall flaps OFF and tell the engine control unit. To put on a Stage 1 , optimize fuel consumption etc. The best is a Flasher for BMW/FORD/Audi/ Mercedes. I would be grateful for every help.