Unable to manually set a specific 4G band (MR600)

Hi,
I was unable to find a setting to manually force the use of a specific 4G band.
For example, sometimes the router uses the band 20 instead of 1/3/7 which are much more faster than the 20 one, resulting in a drastic reduce in network speed.
I know for sure that with router of other brand is possible to set this option. Is it possible to enable it with a (beta) firmware update?
Thanks.
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@StefanM is any solution/update available for this ? Thanks
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Update:
There has already been a beta firmware that could manually choose the network band.
If your sim card carrier supported 2CA, you could go to basic>internet to fix two CA bands.
Thank you!
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@Sunshine hey I just bought an archer mr600 today when ever I try to install beta firmware or any other firmware I get these errors, please help.
stock firmware version: 1.2.0 0.9.1 v0001.0 Build 200511 Rel.44954n
Hardware Version: Archer MR600 v1 00000001
"Error code: 71211
Failed to upload upgrade file. Please select the correct file."
"Error code: 4503
The uploaded file was not accepted."
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SAME HERE!!!!!!
1.2.0 0.9.1 v0001.0 Build 200511 Rel.44954n
Archer MR600 v1 00000001
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Archer_MR600v1_1.1.0_0.9.1_ [200417-rel75138] _up_boot_2020-04-20_08.44.31 is the number one beta firmware with band selection option. Under the Basic menu item, under the Internet menu item, the network can be activated.
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router not accepting the upgrade file, i got error
Failed to upload upgrade file. Please select the correct file."
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@Sunshine not working !!!!!
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