Sewn "neproshivayku" (second, ipatched-audit console patched RCM, released after ~ June 2018-year old 20-nm SoC; you can check out theserial number):

• while itonly Maybe c firmware version starting from 1.0.0 ( through exploit Nereba ),
  
• by4.1.0 , inclusive ( through the implementation of caffeine );
  
  here is commonEnglish review,
  instruction step by step from uv. ZloDeUSopraNO (FW 4.1.0).
  switch.customfw.xyz - Running through Caffeine

Downgrade (downgrade firmware) to "neproshivaykah" without CFW docan't .
In sysnand and without an active pegaswitchvery importantnot include Wi-Fi (not to catch supernag and updating), not to upgrade, not use cartridges with games containing FW above version 4.1.0, in general never do not use AutoRCM and suspicious homebrews; perform any actions in emummc with the latest firmware version, so as not to lose the opportunity to firmware / not get a brick. Irreversible. The rest of the process of operating the same.

In the future, probably, further progress is possible in the practical implementation of the exploit dГ©jГ  vu for old consoles on 20 nm chip with firmware installed on it up*BEFORE* version 8.0.0, that is, the last hypothetically vulnerable today remains FW 7.0.1 .
But (if) it will be, it will not be soon.