[gndprx]

I've revived quite a few packs over time and this may or may not help you out.

I dump the pack completely on a Zero 30 discharge tray. Then I'll put it on an equalizer tray that has no cutoff point (does have reverse protection though) and let it sit for about 24 hours to flatline.

Charge it at 1A until it hits temperature (120F degrees +/-). Some charger will false peak for a bit until the pack gets going.

Repeat the discharge/tray process above and then cycle twice at regular charge rates (5A or so) and it should start to come back to life.

If this doesn't work, you may have at least one cell that won't revive. Check each cells voltage at charge to make sure they are all taking a charge. Worst case scenario you can just use it as a practice pack.

Good luck