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Thanks gingerbeardman for your answers.
I've been looking for Repair Manual for PRS900, The link you shared is for user manual. Also, There is a way to increase a darkness when i see the other Repair manuals, it give instructions to enter into Test Mode and get files from manufacturer. But, I've tried searching for software files to enter Test Mode, i didn't get any results, but definitely the files available with service persons.
Thanks a lot for other suggessions you have provided to see font better.
I have tried to flash the reader with the following flashes but i don't see any changes to the device.
PRS900.Flash.Package.1.02d.zip
PRS900.Flash.Package.1.02e.zip
PRS900.Flash.Package.1.03b.zip
PRS900.Flash.Package.1.04c.zip
PRS900.Flash.Package.1.05a.zip
PRS900.Flash.Package.1.06a.zip
PRS900.Flash.Package.1.06b.zip
PRS900.Flash.Package.1.06c.zip
PRS900.Flash.Package.1.0a.zip
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