Thread: Garmin eTREX 20 working as an eTREX 30

hello.

This is a comparison of the PCB of the two models of Garmin GPS Etrex 20 and 30.
As you can see, the Model 20 has no more sensor if they are in version 30.
That is why the 20to30 firmware does not work exactly like a etrex 30.

In the images leave the 3 models of chips used, if anyone WANT add.
Although I think only the barometric sensor is easy to solder.

Furthermore you can see in the last picture the 3 main chips used in these models.

CPU: STA8088EXG
2GB Memory: Samsung KLM2G1DEHE-B101 This memory can have two configurable boot. ¿Region 5 - Boot Block? and ¿region 12- Boot.bin?
256kb Memory: K5N5629ATA [NOR 256Mb] Could this be the NV?


Combining KLM2G1DEHE-B101 + K5N5629ATA [NOR 256Mb] is widely used in some mobile phones, so maybe you could read and write these memories with some software used in phones, to repair firmwares (boots corrupt).

Someone can provide more info?

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