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Procedure for upgrading firmware in GT31 (by Tom Chalko, approved by Locosys)
Version 6 May 2010
This procedure is faster and safer for your GT31 than previously published procedures.

1) Install GT31 Upgrader V0.71 (or higher), if it is not installed already. 
   Installation file is included in the zip file
2) Install USB-to-serial driver, if it is not installed already
3) Clear Data Logger before upgrade (DATA LOGGER>CLEAR>YES)
4) Close all Windows applications and disconnect from Internet

5) Turn GT31 off 
6) Remove the SD card and find a tiny sliding switch "inside the card slot" on the pcb,
   on "display side" of the card slot. The switch has a black lever and metallic body.  
   The default position of the switch lever is labelled in white on pcb.
7) slide the switch lever using a match or a similar object
8) use GT31 Updater V0.71 in "internal" mode to load 2 files, one at a time:
     a) V31BOOT_V4D.s (you only need to update this file when upgrading to V1.4 from V1.2 or V1.3
     b) V1.4 firmware
     It may be necessary to quit and re-start GT31 Upgrader V0.71 after the first file update.
9) when Updater finishes, disconnect GT31 from USB cable, move the switch lever to its normal position, 
   labelled white on pcb.

GT31 should be ready to use.

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