Tried re-installing OS but got this:
loader> install file:///jinstall-ex-2200-12.3R12.4-domestic-signed.tgz
Package /jinstall-ex-2200-12.3R12.4-domestic-signed.tgz is signed...
/kernel data=0x4e640c+0x6c65c syms=[0x4+0x97860+0x4+0x894e7]
Kernel entry at 0x1400100 ...
GDB: debug ports: uart
GDB: current port: uart
KDB: debugger backends: ddb gdb
KDB: current backend: ddb
Copyright (c) 1996-2016, Juniper Networks, Inc.
All rights reserved.
Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
JUNOS 12.3R12.4 #0: 2016-01-20 04:06:03 UTC
builder@kessuth.juniper.net:/volume/build/junos/12.3/release/12.3R12.4/obj-arm/junos/bsd/kernels/INSTALL-EX-2200/kernel
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It does not want t to go any further...