*** GSM STUDIO HYBRID ***

v1.0 18-07-2016    
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Initial release


v1.1 10-08-2016
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[+] D&R serial number storage in EEPROM. (format: yymmddnnvv)
	yy = year
	mm = month
	dd = day
	nn = index number
	vv = hardware revision
[+] Device alias name storage in EEPROM. (ex. "Tel Hybrid 1")
 

v1.2 07-09-2016
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[-] Bugfix: Device stopped working after some time (stack overflow due to too large USB HID report size)
[+] Alert feature: Reporter can alert studio by pressing the '0' on his phone when having an active connection.

** NOTE: This firmware will only work with GSM Hybrid Control software V2 or above.


v1.3 30-01-2017
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[-] Bugfix: Incoming call is sometimes rejected by pressing the Connect(Ring/hook) button. 


v1.4 03-08-2017
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[-] Bugfix: Initiate a call does not always work. 


v1.5.130.0 30-03-2018
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[-] Bugfix: Heavy USB traffic possibly causes connection lost over some time (days).  


v1.5.150.0 30-03-2018
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[-] Bugfix: Minor bug fixes


v1.5.226.0 20-04-2018
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[*] Complete redesign of the internal communication protocol. Stability improvement. 
[+] GSM Hybrid can operate standalone now without PC software. (all settings are stored internally). 


v1.6.286.0 16-05-2018
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[-] Bugfix: Serial number reading from empty EEPROM results in crash of PC application.
[+] Factory reset: Holding down the [CONNECT] button on the front for at least 15sec (Connect LED flashes 3x).