it's highley unlikely someone would go to the trouble of trying to make an LPC modchip fit under the board. If you don't see a chip (should be very, very obvious), it's TSOP flashed.
SmartXX LT OPX and another chip that I can't remember right now had the ability to be soldered directly to the bottom of the xbox motherboard.
They also had standard pinheader & quick solder options so it's still highly unlikely someone would go about installing them on the underside of the motherboard.
The other chip I was thinking of was the X-Changer v2.5 (wasn't very popular & came out towards the end of the xbox1 life cycle).
X-Changer v2.5 bottom side installation on 1.6 console: http://www.x-changer...c25manual16.jpg
Edited by Alex548, 26 June 2012 - 03:42 AM.