FWIW, someone asked me whether c113 worked. I found a cheap 113a and hello_world loaded pretty well. The screen on my phone is shot but the backlight did come on.

it works fine with the following command:

craig@craig:~/c115-osmocom-bb/src$ host/osmocon/osmocon -p /dev/ttyUSB0 -m c123xor target/firmware/board/compal_e88/hello_world.compalram.bin 

OsmocomBB Hello World (revision osmocon_v0.0.0-1754-gfc20a37)
======================================================================
Device ID code: 0xb4fb
Device Version code: 0x0000
ARM ID code: 0xfff3
cDSP ID code: 0x0128
Die ID code: c5c63637a5039778
======================================================================
REG_DPLL=0x2413
CNTL_ARM_CLK=0xf0a1
CNTL_CLK=0xff91
CNTL_RST=0xfff3
CNTL_ARM_DIV=0xfff9
======================================================================
REG_DPLL=0x2413
CNTL_ARM_CLK=0xf0a1
CNTL_CLK=0xff91
CNTL_RST=0xfff3
CNTL_ARM_DIV=0xfff9
======================================================================
entering interrupt loop