Can someone please do a tutorial to flash the TI-nspire CX CAS?

I upgraded to OS 4.5.5 before realizing it wasn't supported by Ndless.

So now I want to remove the os protection or flash it to downgrade the os and install Ndless.

I'm willing to buy the USB/TTL interface.

Thank you!
Downgrading is impossible, sadly. Sad
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