I have bought a Tk102 (I think Coban clone beacuse it give me geo-info+ wxlxy.com...) and it has the power saving mode, so the charge can last up to 10 days!
After few months I have bought another TK 102 (i think Xexun because it gave me only a web link to google maps), but it not go in power saving mode (the green link continue blinking) and so the charge last only 2 days!
How can I enable power saving mode on TK 102 XeXun? Is there a firmware to do it? Or I can install the firmware of Coban Tk102 on XeXun Tk102?