# The same AT+RMTXPOWER commands work sometimes but not others **URL:** \ **Category:** Legacy HL Series\ **Created:** [March 3, 2020, 6:44pm UTC](https://forum.sierrawireless.com/t/the-same-at-rmtxpower-commands-work-sometimes-but-not-others/19601 "2020-03-03T18:44:53Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![david.king](https://avatars.discourse-cdn.com/v4/letter/d/96bed5/32.png) [@david.king](https://forum.sierrawireless.com/u/david.king)\ **Post date:** [March 9, 2020, 11:50am UTC](https://forum.sierrawireless.com/t/the-same-at-rmtxpower-commands-work-sometimes-but-not-others/19601/7 "2020-03-09T11:50:08Z")
Hi Vianney, Many thanks. I’ll try that. Is it mentioned somewhere, in some document I ought to have read ? Meanwhile, I’ve made a bit of a discovery, by experimenting. I’ve found that the _occasional_ ERROR response to 2G `AT+RMTXPOWER` commands, even though the _exact same_ commands give OK usually, can be ‘worked around’ by preceding every 2G `AT+RMTXPOWER`, with `AT+RMTXPOWER=0`, then 20 ms wait. I’ll see if an HL7692 firmware upgrade, from version **2.23** to **2.27** , changes things at all, in this respect. I’ve also made a discovery with the other HL7692 issue I’m seeing. You might be interested to see this thread, and in particular my most recent post: > [@First AT+WMTXPOWER or AT+WMRXPOWER after boot, fails - known bug?](https://forum.sierrawireless.com/t/first-at-wmtxpower-or-at-wmrxpower-after-boot-fails-known-bug/19598/4): > > Hi Cherokee, I see that Vianney has a suggestion, for how I might get the HL7692 firmware version 2.27 installer to work, to upgrade from the version 2.23 that our HL7692 came with. I’ll try that suggestion now. Meanwhile, I’ve made a bit of a discovery, by experimenting, with why commands sometimes receive no response. It’s looking like the HL7692 UART receive buffer, hardware or firmware, is occasionally being left with something within (could be whole previous message, could be partial… Best regards, David --- _[View the full topic](https://forum.sierrawireless.com/t/the-same-at-rmtxpower-commands-work-sometimes-but-not-others/19601)._