How to be able to install and use any app on FP Open OS [meta discussion]

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Thanks retsipf for your reply.
I found this threat on “installing any app”. Reckon I have to use step 5. Step 0 is straight forward, but can someone tell me if I need both 1a and 1b?

Step 1a: Patch the framework.jar with Tingle to be able to spoof signatures.
Step 1b: Uninstall root.

https://forum.fairphone.com/t/pencil2-how-to-install-any-app-on-fp-open-os-for-beginners-and-experts/22516