Installing the semi-untethered Chimera jailbreak on an iPhone 5s, running iOS 12.5.7. Should work on lower versions of iOS 12 as well, devices running the A7 - A11 chipset (and now A12 with sort-of recent updates). Credits to the development team(s) given during the video, and below as well.

Chimera Link: https://chimera.coolstar.org/

DudePingu Discord: https://discord.gg/w7g8Ezme

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Credits/Twitter/Socials/Github:
CoolStar: https://www.twitter.com/CStar_OW
Jamie Bishop: https://www.twitter.com/jamiebishop123
Tri'angle: https://www.twitter.com/tri___angle (GitHub - https://t.co/R36DiHcxAS)
Tihmstar: https://www.twitter.com/tihmstar (Patreon - patreon.com/tihmstar)
Brandon Azad: https://www.twitter.com/_bazad
PsychoTea: https://www.twitter.com/iBSparkes (Mastodon - https://t.co/bxVLM1pi19)
Nedwill: https://www.twitter.com/NedWilliamson (Infosec - https://infosec.exchange/@nedwill)
Umang Raguvanshi: https://www.twitter.com/umanghere
Ayden Panhuyzen: https://www.twitter.com/aydenpanhuyzen
Aesign: Designer - https://www.twitter.com/aesign_

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If the jailbreak is still failing on your device after multiple attempts, try the steps below (slightly edited):

[Credits to u/GlossedDev for the initial compilation of information and post to the r/Jailbreak subreddit]

1. Reboot phone normally (i.e. Hold power button, slide circle to right to power off phone, wait 10 - 15 seconds, press and hold power button again until device powers on)
2. Open the Chimera jailbreak app
3. Select "Enable Tweaks" (which may appear as "Disable Tweaks" instead) to turn off, then on again. I waited about 3-5 seconds in between enabling and disabling this toggle, repeated between 6-10 times
4. From your Notification Center turn off Wi-Fi and Bluetooth, then switch on Airplane mode
5. Go to Home Screen, wait for phone screen to automatically turn off.
6. Wake phone, navigate to Chimera jailbreak app, start jailbreak.
7. If this fails, go back to Step 1 and try again.
8. ???
9. Jailbroken

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Here are some helpful repos to get you started:

http://akusio.github.io/
http://apt.clezz.com/
http://beta.sparkservers.co.uk/
http://beta.unlimapps.com/
http://cemck.github.io/repo/
http://coolstar.org/publicrepo/
http://cydia.ichitaso.com/
http://cydia.kemmis.info/
http://cydiageek.yourepo.com/
http://eswick.github.io/
http://getdelta.co/
http://ib-soft.net/cydia/beta/
http://julioverne.github.io/
http://junesiphone.com/supersecret/
http://limneos.net/repo/
http://m156nrkvv.g2.xrea.com/beta/
http://m156nrkvv.g2.xrea.com/repo/
http://repo.nullpixel.uk/
http://rpetri.ch/repo/
http://ryleyangus.com/repo/
http://skylerk99.github.io/
http://tateu.net/repo/
http://tigisoftware.com/cydia/
https://apt.alfhaily.me/
https://apt.noisyflake.com/
https://beta.cpdigitaldarkroom.com/
https://brianleek.github.io/repo/
https://ca13ra1.github.io/repo/
https://classicxiirepo.github.io/
https://creaturecoding.com/repo/
https://cydia.angelxwind.net/
https://cydia.hbang.ws/
https://dubailive.github.io/
https://evynw.github.io/
https://exqusic.github.io/
https://ib-soft.net/cydia/
https://idevicehacked.com/
https://jakeashacks.ga/cydia/
https://karimo299.github.io/repo/
https://kurrt.com/repo/
https://leftyfl1p.github.io/
https://lumartti.github.io/
https://mpg13.github.io/repo/
https://poomsmart.github.io/repo/
https://repo.applebetas.co/
https://repo.cpdigitaldarkroom.com/
https://repo.dynastic.co/
https://repo.incendo.ws/
https://repo.nepeta.me/
https://repo.packix.com/
https://repo.thireus.com/
https://rko1195.com/cydia/
https://shiftcmdk.github.io/repo/
https://skitty.xyz/repo/
https://skylarmccauley.xyz/hacked
https://sparkdev.me/
https://spicat.github.io/
https://tdmd.github.io/
https://xenpublic.incendo.ws/

(Now also on the discord)

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Disclaimer: This video is for entertainment/sort of educational purposes only, by watching it you assume all responsibility for any of the information you implement from it during your repair and any resulting consequences. I am not liable for any loss, damages, mistakes, or anything else during, before, or after your modifications or otherwise.

Feel free to leave a comment, and if you found this video helpful please consider subscribing as well! It greatly helps to support the development of more content like this in the future, and I appreciate it.

- DudePingu