R20B Frimware update "Size of uploading file is too large!"

R20B Frimware update "Size of uploading file is too large!"

Hello,
if I try to update my Akuvox R20B from Firmware version 220.30.3.7 to version 320.30.10.9 I receive the following error message:
"Size of uploading file is too large!"
I have downloaded the firmware from this site:
https://knowledge.akuvox.com/docs/r20b-firmware

Could you suggest how I should proceed to get the latest firmware version on my device. For my device data please see below.

Thanks in advance

ModelR20BX3


Firmware Version220.30.3.7
Hardware Version220.0



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