C
Another two options. One is a hardmod and the plaintext downgrade. The other is to send it to someone who can do the plaintext downgrade.
That is also a good way to corrupt your files. Electrical tape does not hold that well. If those wires slip and touch something critical. A spark, a wisp of smoke, a dead console....
Or you could spoof the update fileshum, the hardmod would allow him to downgrade NATIVE_FIRM without a previous NAND backup. Just saying.
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Nope. That's a minor reason. The biggest reason for no software-based downgrades on 11.0 is the minimum-version check, which doesn't allow you to install older titles. Even if we had an ARM11 kernel exploit, we wouldn't be able to downgrade via software on 11.0. To bypass the check we'd need an ARM9 exploit, rendering any downgrade useless (except for people who want to downgrade to 2.1.0 for the OTP)