hey guys - got a e-flight 10amp esc for my p-40 300 need to know how to chang programing from 3c to 2c , thanks zach

I think it auto detects the cell count. The manual says -

"The controller will indicate the soft cut-off voltage setting every
time you plug the battery in by first emitting a low, long tone, to show
startup. You will then hear 2 (for 2-cell Li-Po) or 3 (for 3-cell Li-Po) medium
length, mid tones to indicate the cell count (or 7 beeps if 70% Smart Cut is
selected), helping you to confirm the setting before every flight."

You can download the manual from this page.
http://www.e-fliterc.com/Products/Su...LA1010#manuals