Nokia 7705-SAR-HMC help

I picked up one of these Nokia routers really cheap on eBay. I thought it would be a good way to get my feet wet with SR-OS. These are FCC Part 96 (CBSD EUD) compliant and we run our own private LTE core, so kind of a cool added bonus. Anyways, when I boot it up, all I get on the console port is

U-Boot SPL 2018.09-TiMOS-H-19.10.R2 (v12) Git: [ Tag/Hash: TiMOS_19_10_R2-0-gef19b3ba0 ] (Dec 17 2019 - 03:30:33 +0000) Trying to boot from NAND U-Boot 2018.09-TiMOS-H-19.10.R2 (v12) Git: [ Tag/Hash: TiMOS_19_10_R2-0-gef19b3ba0 ] (Dec 17 2019 - 03:30:33 +0000) CPU: Freescale LayerScape LS1020, Version: 2.0, (0x87001020) Clock Configuration: CPU0(ARMV7):600 MHz, Bus:300 MHz, DDR:800 MHz (1600 MT/s data rate), Reset Configuration Word (RCW): 00000000: 0610000c 00000000 00000000 10000000 00000010: ff000000 08cc7922 e0185a00 81046000 00000020: 00000000 00000000 00000000 08040f00 00000030: 00000105 0004b100 00000000 00000000 Model: Nokia SAR-Hmc Board Board: SAR-Hmc, boot from NAND Watchdog enabled I2C: ready DRAM: 2 GiB NAND: 512 MiB Loading Environment from NAND... OK In: No input devices available! Out: No output devices available! Err: No error devices available! 

The listing claims that this was a new device but I know absolutely nothing about Nokia hardware. Can anyone help me get a command prompt on this thing?