So yours might be patched.
There's a tutorial on gbatemp to test if the Switch has been patched.
Follow the instructions, at your own risk (as usual) https://gbatemp.net/threads/a-definitive-way-to-test-if-your-switch-is-patched-or-not-purchases-after-07-2018.512018/
To enter RCM, I recommend buying a cheap plastic jig on ebay. (that's where I got mine.)