# Dead GPS-RTK2 Board - ZED-F9P (Qwiic) ? **URL:** \ **Category:** Development Boards\ **Created:** [September 13, 2019, 4:20pm UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727 "2019-09-13T16:20:47Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Stephane\_P](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@Stephane\_P](https://community.sparkfun.com/u/Stephane_P)\ **Post date:** [September 13, 2019, 4:20pm UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727/1 "2019-09-13T16:20:47Z")
Hi! I’m using a GPS-RTK2 Board - ZED-F9P (Qwiic) since a few months, and it was working correctly. But since today, every time I power it up, the led “power” “pps” and “fence” stay on and I don’t receive any data from the uart. When I connect it with Usb, Windows says _“unknown peripheral, Device Descriptor Request Failed”_ I can get some information if I send 0x55 0x55 to it (via uart1) and connect it to u-center, and I can flash it successfuly, but after a power cycle, I encouter the same problem. The F9P seems to be always in safeboot even though the safe pin isn’t connected to GND. There is no internal shortcut between safeboot and gnd. A visual inspection shows nothing strange. Is there a way to “unbrick” it ? ---
**Author:** ![TS-Chris](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-chris/32/6057_2.png) [@TS-Chris](https://community.sparkfun.com/u/TS-Chris)\ **Post date:** [September 13, 2019, 9:50pm UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727/2 "2019-09-13T21:50:42Z")
Hi Stephane. Have you tried connecting it to an Arduino via I2C and running the FactoryDefault\_I2C sketch? That _should_ bring the GPS back to life. Failing that, there’s a ‘Default Config’ button in U-Center you might try that should set the GPS back to factory defaults over USB. ---
**Author:** ![Stephane\_P](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@Stephane\_P](https://community.sparkfun.com/u/Stephane_P)\ **Post date:** [September 14, 2019, 7:23am UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727/3 "2019-09-14T07:23:33Z")
Hi TS-Chris! I can run the FactoryDefault\_I2C sketch successfuly, but I still don’t receive any byte when I run Example14\_DebugOutput sketch. Same behaviour after I connect the reset pin to GND. I can’t connect the F9P over USB anymore (Device Descriptor Request Failed) When I connect the F9P with an uart/usb adapter, then connect the F9P to U-Center, I can get some informations like these : Software version: ROM BOOT 1.02 (a11814) Hardware version: 00190000 Extensions: PROTVER=26.00 - MOD=ZED-F9P There are some informations available on this screenshot, safeboot is always active: ![zed-F9P.png](https://canada1.discourse-cdn.com/sparkfun/original/3X/6/6/66aa8b428eda8782fdf8406efac6de732c0ed8c5.png) ---
**Author:** ![Stephane\_P](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@Stephane\_P](https://community.sparkfun.com/u/Stephane_P)\ **Post date:** [September 17, 2019, 2:53pm UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727/4 "2019-09-17T14:53:59Z")
Hi! The F9P stayed unpowered for 3 days. Yesterday I powered it up and… the F9P started correctly. That’s weird!! I have used it this morning and everything was ok. But, since 1 hour, the problem is back. I can’t use it anymore. 😢 ---
**Author:** ![TS-Chris](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-chris/32/6057_2.png) [@TS-Chris](https://community.sparkfun.com/u/TS-Chris)\ **Post date:** [September 17, 2019, 3:55pm UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727/5 "2019-09-17T15:55:46Z")
Hi Stephane. That’s very odd and not something I’ve seen before. Can you PM me with your order details? (Order or invoice number) ---
**Author:** ![Stephane\_P](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@Stephane\_P](https://community.sparkfun.com/u/Stephane_P)\ **Post date:** [October 10, 2019, 2:57pm UTC](https://community.sparkfun.com/t/dead-gps-rtk2-board-zed-f9p-qwiic/37727/6 "2019-10-10T14:57:59Z")
Hi! Some news: I had this problem 1 or 2 more times. Each time, the F9P was restarting correctly if I waited a few hours before powering it up. Since then, I think I found the culprit: I had inserted a simple switch on the vcc line to power it off. But I noticed that with the F9P off, some leds were still a little powered. Now the switch is on the GND line and I didn’t have any problem.