Maybe your know. There are a lot of  one time chip for epson surecolor T3200 T5200 T7200 T3270 T527 T7270 not work befor,  because the supplier only have 30 sets serial number, the plotter can remember the serial number, once the plotter found the same serial number ,it will can't work.

Now our company made new chip for epson surecolor T3200 T5200 T7200 T3270 T5270 T7270. the new chip have 160 sets serial number, this way the plotter duffcult to found same serial number. so the new chip more stable.