they wanted a copy of my entry stamp....my pic was glued to the tm7... Be careful of the glue, it will soak thru and distort the ink on the opposite page ..
I just did it at the immig office near the Chiang Mai airports 2 days ago...it went smoothly, they're very organized there...it was my first renewal so I was nervousππ. Just be sure you have the TM 30 and it has a 'leave' date