Hi Harald, Please keep in mind that the board I sent you back in April has not been calibrated: because you claimed it early, it was sent to you before our FreeCalypso RF calibration software (replacement for Openmoko's original which according to you has been lost and couldn't be found) had been developed later in the summer. According to my notes, that board I sent you did have a properly formatted flash file system structure in the first 2 MiB of the second (non-bootable) flash bank, but there are no /gsm/rf/* calibration files in that FFS. If you have a CMU200 which is itself in good calibration standing and an N-to-SMA cable whose insertion loss at the GSM frequencies of interest is precisely known (very important), you should be able to calibrate your FCDEV3B board yourself with my FreeCalypso tools: https://bitbucket.org/falconian/fc-rfcal-tools As alternative options, you can ship the board back to me and I can reship it to you with calibration, or I could send you one of my second-batch boards (already calibrated), and then you send the old one back to me once you receive the new one and confirm that it's good, so you don't have a time window without any board. In the interest of full disclosure, my own CMU200 currently has uncertain calibration status, and I've been told that getting it calibrated at R&S's USA (Maryland) office would cost somewhere around $1600 USD. Unless some sponsor covers it sooner, I expect to be able to make that expenditure some time in 2018 and get truly dependable calibration, but until then there is about 0.5 dB of uncertainty in the Tx power levels I calibrate on FCDEV3B boards. It should definitely be within the tolerances allowed by the GSM 05.05 spec, but I am a perfectionist... There is a more detailed explanation in the doc/Tx-cal-theory article in the fc-rfcal-tools source repository linked above. M~