Problem installing update for a2109 microsd2

Hi all

I recently bought a Chinese version of the A2109 and wanted to install the US firmware. Takes place in the mircosd2 firmware (I guess that's the microsd card). However, when I went into recovery mode, it says "cannot mount /sdcard (invalid argument)". When I try to go to the option "install external memory update" once again, there as well.

First of all, I don't know that I'm doing the right things. All the advice, it's quite welcome. Thank you all!

You have to put in on the external micro sd card.  The micro sd card card must be formatted FAT32.

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