Lot of folks use installers for the various switch modchips. You probs had your handheld and it blank screened in the first week/month, sometimes it's incorrect files on your SD, sometimes it's firmware, and sometimes it's hardware related. My suggestion to those that paid someone to install a modchip, refer to their installers. You don't want to open up your handheld and void any warranty you may have with installer. I know you're eager to get back to homebrew gaming, I also know this community is an amazing resource pool for troubleshooting but if you used an installer save yourself headache, time, and grief. Reach out to the installer without hesitation.