PSA: If you want to farm Thunderhead armour without doing Terminal Overload or Neomuna Lost Sectors
By using the lost sector/full engram inventory glitch, you can open the engrams that went to your post box at the Neomuna post and they turn into the destination armour.
So pick your easiest and quickest LS anywhere, visit Neomuna and profit.
Edit: Also works in Pale Heart. I’ve previously tried in the Enclave and Kepler but got the same as what’s in the World pool (Tech Sec, Ferro, Swordmaster and Smoke).