This method is still working?

[Canawan]

Hello sir, If this method still works, please give more specific instructions. For example, where can I download the nginx.zip file? How do I install rootCA.crt to Trusted Authorities? I have a bose quietcomfort earbud that is flashing red and white error and now it is very difficult to find working instructions to downgrade the firmware to fix it. Thank you veru much!