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Kevin Redon kevredon at mail.tsaitgaist.infoHi The corrections have been applied. I hope I did not forget anything. The main changes : - reset is a jumper - bootloader switch added - 100k resistors used (instead of 4.7k, I hope it does not break anything) - jack connector added (for the debug) - WP from flash connected - USB voltage regulator TPS73633 used (lower capacitance) - USB buffer used instead of the openPCB solution (thus no pull-up and reset connection). saves space and complexity - pin renamed - QS3244 instead of QS3245 used, I/O and other pins are controlled separately - ... To make the changes I used the AT91SAM7X-EK Evaluation Board User Guide. The overall capacitance is reduced, but I think the 22uF for the battery should be kept. files : https://gsm.tsaitgaist.info/SIMtrace/v0.7/ good luck, Kevin