Guys i'm going crazy, never had any trouble since day 1 of switch hacks

I Was on 16.0 FW and hekate 6.0.4 and atmosphere 1.5.3 , working great, i decided to update to 18.1.0 FW, hekate 6.2 and atmosphere 1.7.1, I put the files on my SD card, also modified the hekate_ipl.ini and the sigpatches v2 you gave at the start of the thread. And I don't manage to boot on hekate or anything since then.
I get an RCM OK from Tegra RCM 2.6 but the screen remains black, I tried with a RCM Loader directly, it flashes green and blue as normal, and i see a little flash of light for a brief half a second on the screen and it stays black. So it's like something is preventing from loading hekate. I tried to put back all the appropriate files from older version that were working and I get the same problem. I tried a fresh SD Card, put the files on it, same problem. I don't know what is happening.
I have an emummc on the regular SD Card i'm using, but not on the new one I also tried.
Yet I have no problem booting on the regular NAND of the switch if I press the power button for like 20 sec, and the start the console again.
Thanks for your help