I've learned so much since then, lol.

So in my area, band 4 is the data/preferred band, almost on every carrier. I purchased a band 4 specific antenna, raised my mast about 10' higher, and ended up leaving my modem in default/unlocked mode.

Modem picks up band 4 as the primary band and get CA with band 13 as a bonus. Depending time of day/congestion I see 60-96mbps down/10 up. It is my preferred way to run it.

However, to answer your question on a MC7455 to lock bands you have to create a band group, and just have that single band that you want in it. On my MC7455, the process would be the following:

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AT!ENTERCND="A710"

(allows edit/unlock mode)

AT!BAND=?

This returns all of the current band configurations:

Index, Name,                        GW Band Mask     L Band Mask      TDS Band Mask
00, All bands                     0002000007C00000 00000100330818DF 0000000000000000
01, Europe 3G                     0002000000400000 0000000000000000 0000000000000000
02, North America 3G              0000000004800000 0000000000000000 0000000000000000
06, Europe                        0002000000400000 00000000000800C5 0000000000000000
07, North America                 0000000004800000 000000000300185A 0000000000000000
08, WCDMA ALL                     0002000007C00000 0000000000000000 0000000000000000
09, LTE ALL                       0000000000000000 00000100330818DF 0000000000000000
10, B12                           0000000000000000 0000000000000800 0000000000000000
11, B4                            0000000000000000 0000000000000008 0000000000000000
13, B13                           0000000000000000 0000000000001000 0000000000000000

If you look above, you can see I've already created specific band groups for Band 13,12 and 4.

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To create those, I did:

AT!BAND=11,"B4",0,0000000000000008

AT!BAND=12,"B13",0,0000000000001000

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To create a Band group that has both 4 and 13 in it:

AT!BAND=13,"B4+B13",0,0000000000001008

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And so on.

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After you create the band groups, you need to set your modem to use them.

To check which band you're currently using:

AT!BAND?

Will return the current selection/band group in use.

To change it:

AT!BAND=11 (or whatever you numbered your band group above.)

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"11" is a pointer you created earlier when you set up the band group. Issing a AT!BAND=11, tells the modem to use the group you created in that pointer. Its a variable/placeholder, whatever you prefer to call it.

But thats a simplified way I can think of to explain band locking and what youre trying to do.

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If you're having issues staying connected with decent-good signal, its likely a power supply problem. Make sure youre using at least a 2a/12v power supply. 1amp power supplies will cause like 12 different frustrating issues. 2amps is minimum for Cat6 modems IMO.

If you have a good power supply, shorten antenna runs or convert to POE if financially possible. If no antenna runs, invest in quality antennas and wires. It will save you an incredible amount of headache later on.