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Firmware upgrade - to do it or not?

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Hi, all.

I bought a GF8 WRX about six months ago with a Link G3 ECU installed (firmware version 1.5.1).  The setup (both electrical and programming) was a complete mess when I got it but gradually I've been working my way through it all.  Now I've got it almost sorted, and I'm using almost all of the features available to me and working around certain electrical and software bugs (eg. I've had to set up a completely custom ECT calibration table and also manually compensate -50C on ECT-driven Aux Output logic).

I have a wideband sensor and controller, 0-5V output going into the Link ECU (on the "AN Volt 1" channel) .. the ECU picks it up and logs it properly, no problems there.  But I'd like to use QuickTune and I can't.  The two symptoms are:
(a) even though I've fixed the weird default values in my "AFR Targets" table (so I have X=RPM 0-7500 in steps of 500, and Y=Engine Load 0-200 in steps of 20) and filled in the table, it never tracks off the top row (0 load) no matter what the actual MAP/MGP/TP is, and
(b) when I try to QuickTune, it follows the Actual AFR just fine but there's no Target AFR.  If I attempt to tune, an "Oxy target undefined" message is shown.

I did manage to find a link for firmware v1.9.2 in this thread:  http://forums.linkecu.com/index.php?/topic/5362-how-to-update-firmware/

So, my questions (for today, at least *grin*) are:

1. Is this QuickTune issue a problem with the 1.5.1 firmware, which would be solved by upgrading to 1.9.2 firmware?  Or is it something else, which I can resolve to be able to use QuickTune?

2. Does firmware 1.9.2 have a full changelog from 1.5.1 so that I can check over -everything- and make sure all is as it's supposed to be?

3. Will I be able to flash back to 1.5.1 if anything strange turns up?  If so, where can I get a 1.5.1 firmware download?

 

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Aha!  Thanks very much, Scott. Going by that, I'm guessing that my software supports QuickTune but my firmware doesn't quite :)   I'd also bet that it would fix the craziness that happens when I enable TPS-based accel enrichment (+250% fuel at idle with 0% throttle!) 

Because I'm overly cautious, I'd REALLY like to be able to flash back to 1.5.1 should anything odd happen - any chance of getting a copy of the 1.5.1 installer? 

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Soooo...  I grew some balls and went for it, and everything looks good.  Thanks for your help, Scott. 

For reference if anyone finds this thread later:

* the 1.9.2 download linked above isn't the flasher itself but an installer for the flasher. It displays a very comprehensive change log during installation. Read it. 

* there were significant changes right after firmware version 1.5.1, rolling back would not be a good idea.

* the "minus 50 degrees" bug has been fixed- if you have any switch logic which uses ECT then you will have to modify values after upgrading. 

* QuickTune works (but only on Fuel Table 1, not necessarily the active fuel table!). 

I would definitely recommend applying the firmware upgrade (and allowing just a little bit of time to check and test everything afterward, but it shouldn't take long) to anybody who hasn't yet done so. 

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