Can not set HP Laser MFP 137fnw to scan in 600dpi

Hello!

This is the hardware I have:

$ scanimage -L
device `escl:https://192.168.100.137:443' is a HP 40E3C60A8A2 (HP Laser MFP 131 133 135-138) flatbed scanner
device `airscan:e0:HP040E3C60A8A2 (HP Laser MFP 131 133 135-138)' is a eSCL HP040E3C60A8A2 (HP Laser MFP 131 133 135-138) ip=192.168.100.137

Theorically I should get 600dpi, right? It says in the product description: "Scan resolution, hardware: Up to 4800 × 4800 dpi"

Using scanimage, setting --resolution to 300 or 600 gives me the same image.

Using xsane, it just doesn't offer me 600 in the resolution choices.

Is there a way I can change the specification so 600 is enabled?

Thank you very much!!

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