Start substrate manually

[DerLudi]

So… I got my old iPhone 4 (3,1) 32gb to run (downgraded to 6.1.3) thanks to the incredible Legacy jailbreak community who keeps servers up, tweaks available and so much more. I just finished installing 174 apps on the phone, countless repo‘s and and cool tweaks, it was really shaping up.

Then, of course, I did something incredibly stupid. When jailbreaking with Legacy iOS Kit I chose a custom boot logo, which got squished because the dimensions weren’t right. I thought I could fix that with the tweak “Boot Logos Pack 1” (ModMyI repo). All other boot logo packs said they needed specific jailbreaks, but this one was compatible and didn’t say anything about a specific jailbreak. I installed it, it also installed “animate fixed” (Jarxy repo), everything went through with no hick-ups. I thought it was going well since it appeared in settings and there were 2 selections grouped together at the top, and it showed:
Apple (original) which wasn’t selected, and
Something with “C” (I forgot) which reminded me of the legacy ios kit jailbreak and this was selected.
The other 7 boot animations were listed below, I selected one of them, wanted to try it out and rebooted, and it got stuck on the boot logo… (it’s was the old custom boot logo, the squished one where it always worked before)

After putting it into DFU and trying some things in Legacy iOS Kit (didn’t really do anything) I unplugged and rebooted holding down the volume up button which did work. Felt like a miracle to me, thank you god, uhhh I mean, devs! 🙏
I found out now it’s not “substrate safe mode”, it’s actually “no substrate mode”. So, as I understand it, the whole jailbreak hinges on substrate, but I don’t actually have any clue how that works. ^^
I have the phone booted up now, I tried uninstalling the tweaks but it didn’t work :( got stuck on boot logo again, booted up in no substrate mode again. Now I installed the tweaks again. Thought I needed the help here already because dpkg didn’t wanna run at first, but on second try it just worked. I have the tweaks reinstalled now, but I still can’t access the settings to change them back. I need to somehow activate that part of the jailbreak so this shows in settings again, or maybe start substrate while booted if possible and respring (then it should show again along with everything else, right?)(is substrate a service? Can you, like, start it with ctl or something?) or find the .plist with the settings option or something. Help would be greatly appreciated 🙏

[DerLudi]

Ok so I have this fixed half way. Normal boot is still broken for me, but this is how to start substrate manually:
If you start up in "no substrate" mode, so by holding down the volume up button while restarting, you can start substrate and thereby all your tweaks, by simply reinstalling "Cydia Substrate" AND "Substrate Safemode" in Cydia (at the same time! by queuing). Cydia will then promt you to respring, and tada, everything is running. This is on iPhone 4, iOS 6.1.3.
Cydia Substrate might be called "Mobile substrate" for you.