Confirmed with shadow, the GPS module is not same as previous version, so the firmware for GT550WS/GT680W/RX300 is different.
Below FW is only for the version with NEW GPS module.
GPS PLAYER TOOL:https://dl.dropboxusercontent.com/u/22493212/firmware/gt680w/PlayerSetup_Google_ShadowPlayer.zip
I have the silver gt680w and have just replaced my old GPS unit with the new GPS unit, it would not work with V2.4 Firmware, I contacted Foxoffer who sent me V3.5 to test, I tried this and it worked i also had tried V2.7 whilst i was awaiting a reply from Foxoffer, (who were very fast to send me the updated firmware), So to sum things up my silver GT680W and the new GPS unit works with either V2.7 or V3.5 Versions of firmware, hope this information might be helpful to anyone having problems.by the way, my version is silver gt680w.
If the symbol is flashing without the module plugged in, that is a different issue that may be contributing to the problem. I'm using FW v2.7 on my first all black GT680W and the icon flashes yellow for a few then quickly locks. Here is the link foxoffer provided me for FW2.7:I have same problem.no gps signal. all the time gps icon is flashing, with or without gps antenna connected !
Please check your personal messages.billnick - Please post the link for V3.5. I just purchased my second all black GT680W via E-Prance on Amazon that has FW V3.5. My "spare" gps module purchased one year ago due to a hiccup works on the first unit with FW V2.7, but does not work with the new unit. I'm going to try V2.7, but I would like the file for V3.5 in case I need to return to the original firmware and purchase a compatible GPS. Thanks
I tried v2.3 and it doesnt work. (my old version v2.5g)
the satellite symbol in the LCD display was blue when my version v2.5g but now this satellite symbol is yellow. And how can I turn my old version (v2.5g) or newer version?
For my conundrum above, I tried to load V2.7G per link above, but the firmware didn't load. I found V3.0G at http://www.shadow-tec.com/Download.asp which loaded in a blink, but still same issue. Then loaded V2.4G from https://dashcamtalk.com/gt680w/#Firmware in a blink and the gps locked before I could see the icon flash. The icon is now yellow instead of blue. Who'da thunk. I'm also surprised the new unit looks exactly like my all black first unit, but wouldn't take V2.7G, which is specifically required. Here is the link to my new "all black" GT680W: https://www.amazon.com/gp/B00HDCC8LMI have same problem.no gps signal. all the time gps icon is flashing, with or without gps antenna connected !