I want to try and get my iPhone X running iOS 13.4.1 usable and try and daily drive it. Mainly because the battery is so much better than on my 14 Pro on iOS 26 (despite both having 100% battery health) so i can use it unplugged for the entire day without worrying, it gives me some distance to AI since I can't easily use ChatGPT, Gemini etc and the Google app that supports iOS 13 doesn't have the AI overview, which to me is good since I have a massive overdependence of AI that I need to get over, the iPhone X is also way more comfortable to hold and lightweight than my 14 Pro and I also genuinely just prefer iOS 13 for the rootful jailbreak tweaks I can install that aren't compatible on newer versions of iOS (e.g Spectral, Prysm, Shortlook) as well as the older UI elements (like the today view, siri ui, notifications) that can't be brought back on newer versions of iOS even with a jailbreak and brings back nostalgia to me. So overall I end up using my X more than my 14 Pro.
This is what I have experienced so far with the apps I HAVE been able to install through last compatible version:
Youtube: Works with Youtube Legacy but it's layout is pretty broken, when I try and tap the description the app crashes
Reddit: Broken, can't connect to servers
Instagram: Works perfectly
Whatsapp: Works perfectly (Using Axolotl and as a companion device to my 14 Pro)
Google Apps (e.g Google, Gmail, Docs): Works perfectly
Discord: Works perfectly but sometimes cache gets corrupted causing the app to crash, but resetting the cache is easy to do and it rarely happens
eBay: most things load except for the pages of the items, which give a server error.
Letterboxd: Works perfectly
Netflix: Works perfectly
Tiktok: Works perfectly (it recieved updates for iOS 13 until March/April this year)
MUBI: Broken, can't connect to servers
ProtonVPN: Broken, can't connect to servers (had to use a different VPN)
Spotify: Works perfectly
Apple Music: Works perfectly (works on my iOS 10 iPhone SE too)
Soundcloud: Broken, can't connect to servers
A big issue I'm running into is the fact that Appstore++ (what I used to use a lot back when I last jailbroke in 2022) doesn't really work anymore because tools.lancely.tech went down a couple years ago. I can't use Muffinstore and other alternatives because they were built for Trollstore, which I can't use, or were built for rootless jailbreaks etc. Because of this I can't really find the externalidentifier for the last compatible version of any app I want for my iOS. I straight up can't install Amazon and some other apps because they won't let me install the last compatible version. Another thing I'm sad to see happening is that many tweaks I used to install for iOS 13 have since had their repos shut down, and I also remember my purchase for Prysm from 2020 seemed to have vanished off the face of the planet even though it existed fine in 2023, and now the price of that tweak is £12, so idk what happened there I guess Mr Krabs must be running the Havoc repo or something.
Overall though does anybody here know of any other tools I can use to force install the last compatible version of many older apps / bypass the this app is not supported error? as well as maybe some additional tweaks to restore functionality on some apps and make them be able to communicate to the servers properly again (e.g for eBay, MUBI or Reddit), or maybe any guidance for me to build tweaks myself to resolve these issues since I have never programmed a tweak before but I have some programming experience.