Yes. Convert the patched ISO to an EBOOT.PBP using PSX2PSP. Works perfectly on PSP, PS Vita (Adrenaline), and PSTV.
Rebalanced unit stats and a smoother interface compared to the 8-bit or 16-bit originals. Finding the Langrisser 1 and 2 English ISO
The PSX version retains the "classic" feel of 90s RPGs that modern remakes sometimes lose with updated UI.
A faithful but archaic tactical RPG experience, preserved for English speakers thanks to dedicated fan translators. Play this only if you’re a retro purist or want to see where the series started. Otherwise, the modern Langrisser I & II remake (Switch/PC/PS4) is superior in every practical way.
Do not confuse this with the Langrisser I & II remake released for Switch/PC in 2020. That remake uses chibi art and a different composer. Traditionalists almost universally prefer the PSX fan translation over the official 2020 remake.
If you cannot get the PSX ISO working, consider these official alternatives:
The gameplay centers on commanders and their hired mercenaries. You don't just control a handful of heroes; you manage entire platoons (up to 20+ units per battle), creating a scale rarely seen in other SRPGs like Fire Emblem Stellar Audio: