Warframe 1999 Solo H-09 Apex Tank Secret Steel Path Boss (Lettie/Trinity)

Doing the new secret boss introduced in Warframe 1999 for the Lettie accolade (gotta do it solo and using Trinity/Lettie for it to count)
Was slow because of personal skill issues and because the enemies refused to drop the beacon to get the rocket launcher (also, I suck at hacking)

Overall, pretty cool fight even though the end can get bananas with all the exploding techrot, summons, etc. Will probably do it again on Eleanor to get her accolade too.

If you are interested in the stuff I used, your basic armor strip Latron Incarnon works perfect for getting the tank's weakpoints and removing its armor, then I used a crit Laetum (I know the anticrit version hits harder, but I've been playing with a lot of crit frames lately) for the techrot weakpoints on the Infested tank, a regular heavy detonation spam Glaive Prime, and my Trinity is using a bunch of shield mods to get her to have very quick shield regen, plus the Sentinel also gives me extra shields, and boosts the shield when it breaks from time to time. Obviously also ran Arcane Aegis (though only rank 3 because I'm poor) Arcane Nullify (just to try to deal with all the Magnetic procs at the boss) and had Rolling Guard on for the times where my shield would break and I wouldn't want to trust the regen.

Edit: some overframe links

I've already overwritten my ingame build for Trinity but it was more or less this: https://overframe.gg/build/769810/ (that's using default polarities, I have a few forma, but overall the key stuff is there)
My Latron prime build: https://overframe.gg/build/769817/ (basically armor strip+viral)
My Nautilus prime build: https://overframe.gg/build/769819/ (the whole point of the sentinel is to boost my shields and to revive me if I die, so you can use any sentinel)
My Laetum build: https://overframe.gg/build/769825/ (any you already have will do fine, the Laetum is a beast and my build is super unoptimized)
Glaive prime: https://overframe.gg/build/769974/