armando - This is my first post here on Mavic Pilots. I signed up just to encourage you!
I also have a MPP and have been looking into modding it.
I've done plenty of reading and have figured out that the mix and match method won't work on Platinums. ( but I'm certainly no expert )
I know that older firmwares need the SD card to write flight data to, and won't take off without it. But I was HOPING that we could just rollback to 0.700 ( not take off ) edit flight parameters, and then upgrade to 01.04.0000 ( minus the 305,306 modules ), and that it would work. Sadly, it doesn't. I saw a reply on one of digdat0's videos where someone tried that. Didn't work. He had to update everything to latest to get his bird flying again. Don't think he had an SD card installed though.
So it seems that installing an SD card is the ONLY way to mod the Platinum.
So good luck to you! I will be watching your progress
Although, I do hope that another method for modding the Platinum pops up soon.
If you don't mind me asking, what are you planning to mod once you are able? ( you'll get no judgement from me ) I just want to remove the height restrictions. I live in the mountains so 500m is a significant limitation. I also want to play around with the speed a bit. I don't like how slowly it descends. At the very least, I'd like to to descend just as fast as it ascends. Other than that, I just don't want to ever get stuck in DJI JAIL
Again, good luck. I hope everything goes smoothly for you and please come back to post about your experience modding your Platinum