ML307A， 私有命令

at 手册没写吗？然后第一次听说 cfun 能有四个参数的…？确认不是第一个参数有四个值？

AT*CFUN 不是 AT+CFUN ，手册上是没有的,这是取值范围 *CFUN: (0,1,4,5,6,9),(0-1),(0,1),(0-63)

搜了下 PXA1802 的相关如下：

AT*CFUN=<fun>[,<rst>,<isFeatureCfg>,<featureCfg>]
Note:
<fun>:
0: minimum functionality
1: full functionality
4: disable phone both transmit and receive RF circuits
5: update NVM file with minimum functionality mode
6: update NVM file with full functionality mode
9: update NVM file with both transmit and receive RF
circuits disable mode
<rst>:
0: do not reset the MT before setting it to <fun> power level
1: reset the MT before setting it to <fun> power level
<isFeatureCfg>
0: < featureCfg > is not present
1: < featureCfg > is present
< featureCfg >
0-63: bitmap for * aske. Configurations for CSD, FAX, PRODUCTION, CONVENTIONAL_GPS, MS_BASED_GPS, MS_ASSISTED_GPS

https://gregory-gost.ru/wp-content/uploads/2020/09/luat-lte-module-at-command-user-manual-v1.0.pdf

ML307A 用的 ASR1606 ，没找到 ASR1606 的 featureCfg Bitmap ，可能得找原厂要下相关手册了。