T-Mobile 4G LTE CellSpot » History » Revision 5

Revision 4 (eloy, 12/02/2021 11:52 AM) → Revision 5/13 (eloy, 12/02/2021 11:54 AM)

h1. T-Mobile 4G LTE CellSpot 

 _Any information that is and will be posted here is based on reverse engineering or using publicly available information, engineering, without private support from T-Mobile or Nokia. T-Mobile. Use at your own risk._ 

 * "Specifications by T-Mobile of the CellSpot V2": 

 The T-Mobile/Nokia branded version has been labled as the 4G LTE CellSpot V2 with the model "SS2FII Femtocell Multi-band SOHO". The Nokia-only branded version (pictured by the "FCC": has been labeled with the model name "SOHO Small Cell V2 B2/B4". See the "Nokia quick guide": According to "Nokia":, it has a IPSec with IKEv2 and a tamper alarm, so it is better not to disassemble the device to avoid triggering those. Using the LAN and WAN ports, it can be daisy-chained. 

 The device does not seem to support GSM, only UMTS and LTE. According to "pictures of the internals by the FCC":, the SoC is a Qualcomm FSM9955. This SoC incorporates a DSP by Qualcomm from the Hexagon series, see "here": for more detailed information. There is a "Linux kernel for the FSM99xx series": released, made with Yocto. According to the "generic device tree include header":, the FSM9900 series seems to be based on the 2012-era ARMv7 Qualcomm Krait cores. According to a "Reddit post": the FSM9955 also uses a Krait core, but I don't have the kernel sources to confirm this. Maybe request more recent kernel sources from T-Mobile or Nokia.
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