Here is a patch for AT firmware based on ESP8266_NONOS_SDK_V1.1.2 resolved issue that AT user parameter area was located in wrong address，it may cause WiFi configuration goes wrong.
Please update to this new AT bin files and call "AT+RESTORE" to factory reset. If you call “AT+CIPUPDATE” to upgrade，please also call "AT+RESTORE" to factory reset once.
“AT_bin_v0.25_1024+KB_flash_can_upgrade.zip”
- normal AT bin，runs with boot.bin，can FOTA upgrade，need to use 1024KB flash
“AT_bin_v0.25_for_512KB_flash_cannot_upgrade.zip”
- for old version module which flash size is 512KB
eagle.flash.bin downloads to flash 0x00000
eagle.irom0text.bin downloads to flash 0x40000
can not FOTA upgrade，please don‘t call “AT+CIPUPDATE”
"SDK_v1.1.2_AT_patch_01.zip"
- libs for users who need to compile their own AT firmware，replace libs in \esp_iot_sdk_v1.1.2\lib
So sorry for the inconvenience.
更新附件 patch 解决 AT 固件内部参数区使用错误的问题，该问题会导致 WiFi 相关配置从 flash 读取时不正确。请更新附件 AT bin，并使用指令"AT+RESTORE" 恢复出厂设置，以修正原本错误的参数区。如果调用指令“AT+CIPUPDATE”进行升级的用户，也请使用"AT+RESTORE" 恢复一次出厂设置。
“AT_bin_v0.25_1024+KB_flash_can_upgrade.zip”
- 正常 AT bin，与 boot.bin 配合运行，可以升级（“AT+CIPUPDATE”），要求 1024KB flash
“AT_bin_v0.25_for_512KB_flash_cannot_upgrade.zip”
- 针对一些旧版本，硬件仅有 512KB flash 的模块
eagle.flash.bin 烧录到 flash 0x00000
eagle.irom0text.bin 烧录到 flash 0x40000
不能升级，请勿调用指令 “AT+CIPUPDATE”
"SDK_v1.1.2_AT_patch_01.zip"
- 库文件更新给需要自行编译 AT 软件的用户，更换 \esp_iot_sdk_v1.1.2\lib 路径下的文件即可。
给您带来不便，深感抱歉。