arrynrob - for OBi200/OBi202/OBi300/OBi302 (Untested: OBi212. Did you test it? Please discuss at DSLR.)

If your current firmware version is less than 5853, just flash arrynrob directly.
If your firmware is 6259 or greater, you must install stock 5921EX first, then install bypass-uboot-mod.
If your firmware is >= 5853 and < 6259, you must bypass uboot by installing bypass-uboot-mod. Then, you can install arrynrob. DO NOT flash bypass-uboot-mod from 6259 or above, or you will be going to recovery mode (which also allows you to flash any firmware you want, but it just doesn't look as cool).
md5sum OBi302-3-2-2-6259-signed-fw-bypass-uboot-mod.fw = 59229dd211edb52d9f2e49729cee9794

Please read above installation instructions before install arrynrob!
Download - OBi2xx-3-2-2-8680EX-arrynrob11.fw
md5sum OBi2xx-3-2-2-8680EX-arrynrob11.fw = 7ef2a2d316e42c9c3d010ba7ec5deee3
Changes:

1. update clear_zt_params and param_dump to support hw_vers 1.5
2. the changes from arrynrob10:
3. enable dropbear ssh server. default root passwd = "obi".
4. (NEW) included a version of wget that supports https
5. patch obiapp to bypass "zero touch" forced configuration. added clear_zt_params util to clear old zero touch params
6. patch obiapp to use /scratch/contacts.xml for caller id number to name translation lookup.
7. patch obiapp to bypass signed firmware check when loading new fw
8. patch obiapp to bypass GVSIP provisioning lock
9. patch obiapp to bypass 30x models GV initialization block

taoman1 - for OBi2000 series

Installation instructions:

1. To go to a modded fw from stock, flash to OBi2000-6-2-3-4907-signature-bypass.fw first.
   md5sum OBi2000-6-2-3-4907-signature-bypass.fw = 24d0bcad8601d96b5f6b05120181c967
2. Next, install OBi2000-6-2-3-5330-taoman1.fw.
   md5sum OBi2000-6-2-3-5330-taoman1.fw = 03f7cf28f0094296bed48cfe5d3e4f22

Changes:

1. enable dropbear ssh server. default root passwd = "obi".
2. patch obiapp to bypass "zero touch" forced configuration. added clear_zt_params util to clear old zero touch params.
3. patch obiapp to bypass signed firmware check when loading new fw
4. patch obiapp to bypass GVSIP provisioning lock

Mod implemented using a new technique of adding code to the padding at the end of an ELF segment instead of overwriting functions inline, because this fw uses oauth in more places.

olisom - for OBi1022/OBi1032/OBi1062

Installation instructions: If you wish, try to skip directly to Step 3. If you have an old firmware version, it may work.

1. First, ensure you are not using build 4858. If you are, then flash to different version such as OBiPhone-5-1-11-4983EX.fw
   md5sum OBiPhone-5-1-11-4983EX.fw = b10d7c73d8898028fac8698e6d5516b6
2. Next, install OBiPhone-5-1-11-4858EX-noshell-signed.fw
   md5sum OBiPhone-5-1-11-4858EX-noshell-signed.fw = 123bd1842a64ab967644e34e6a7d144c
3. Now, you may install olisom firmware: OBiPhone-5-1-11-5312EX-olisom5.fw
   md5sum OBiPhone-5-1-11-5312EX-olisom5.fw = c2a744a067447a78a348ecd17795c757

Changes:

1. add dropbear ssh server. default root passwd = "obi"
2. patch obiapp to bypass "zero touch" forced configuration. added clear_zt_params util to clear old zero touch params
3. patch obiapp to bypass x509 signature check for new fw

ssyspro - for OBi5 series

Installation instructions:

1. To go to a modded fw from stock, flash to OBi5xx-4-0-5-7707-noshell-signed.fw first.
   md5sum OBi5xx-4-0-5-7707-noshell-signed.fw = 0205d029107d603379eaba37ca6d3956
2. Next, install OBi500-4-0-5-5903EX-ssyspro5.fw
   md5sum OBi500-4-0-5-5903EX-ssyspro5.fw = 1949638ca7161904fbda0da795b8eec9

Changes:

1. enable dropbear ssh server. default root passwd = "obi".
2. patch obiapp to bypass "zero touch" forced configuration. added clear_zt_params util to clear old zero touch params.
3. patch obiapp to bypass signed firmware check when loading new fw
4. patch obiapp to bypass GVSIP provisioning lock
5. NEW: patch obiapp to fix the bug where obi forgot to set the TLS SNI hostname resulting in "No Response From Server" when attempting to connect to GV

naf - for OBi100/OBi110

Download: - OBi1-1-3-0-2886-naf8.fw
md5sum OBi1-1-3-0-2886-naf8.fw = e0496c80d5f308ace35871412ba62133
Notes for use: see naf's post on DSLR.
Changes:

1. add globalsign cert (root for GIAG3)
2. remove firmware downgrade check
3. oauth token request override (not that xmpp works anymore)
4. syslog key/cert dump during backup

Disclaimer

These firmwares, like the official Obihai firmwares, are provided without warranty. Standard precautions apply, such as do not install firmware over a wireless network connection.