However if what you wrote about placing 'the 2 files namely gupdate.gcd and update.txt in a micro SD' was wrong and you have in fact followed the correct procedure then clearly your unit is unable to use SD commands even with a modified boot.bin. In that case you must wait for kunix or another of our Software Experts to post as i cannot help any further with flashing because it seems the unit is unable to write to [i.e. flash] most regions. So if it's internal flash memory is damaged and essential regions of it are unable to be flashed then your unit is only good for parts. It seems it cannot flash properly because your firmware [Software] version is still being reported above as Version 2.60 even though there have been numerous flash attempts with V3.00 and 3.90. Perhaps is is able to flash some regions [rgn 5 for example because it accepts the boot.bin] but that's not enough.
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