You can try this method. It does work for me.
1 - Generate the SOTI client file in CAB format e.g NET_ARM920_921M.CAB
2 - Copy NET_ARM920_921M.CAB to \UserDrive\3rdParty folder of SB1
3 - Create file NET_ARM920_506E.lnk using Notepad with following content:
255#"\Windows\wceload.exe" /noaskdest /noui /delete 0 "\UserDrive\3rdParty\NET_ARM920_506E.CAB"
4 - Copy NET_ARM920_506E.lnk to \Application\Startup folder of SB1
5 - Reboot SB1 and it will be installed in the memory of the SB1
6 - Check now if the SB1 is detected in SOTI Console Manager
Where can we download the NET_ARM920_XXXX.CAB?
Khai-Van Phu provided an instruction video that allow's one to install the MobiControl client on the SB1 and getting it enrolled on the SOTI server. It worked for me. So I am sharing the solution.
How to create SOTI’s MobiControl agent and how SB1 can be staged using MSP Package Builder & RDT Solo.
YouTube Video => https://www.youtube.com/watch?v=nGh5c4uDBfg
Note. MSP Package Builder & RDT Solo are both available for download at Zebra Support web site under section dedicated to SB1