set phy_mode after reset

firmware/sha1sums

@@ -1,3 +1,3 @@
-b05bd9ddf02b481b1091d1ad01dd6da6151fdb30  firmware/0x02000.bin
-8024f70b10e9af7c791f1070809f87706774f7f1  firmware/0x82000.bin
+19e1bc3e4a3df78ed84bc1eb56b1f31b3b0e9936  firmware/0x02000.bin
+35f85e1dc3c92445162190563380678077273d26  firmware/0x82000.bin
 9bd7d25204d71b3db5f35e0b2def8a6aaa7f765c  firmware/0x00000.bin

user/user_main.c

@@ -2804,11 +2804,14 @@ void ICACHE_FLASH_ATTR console_handle_command(struct espconn *pespconn)
             if (strcmp(tokens[1], "phy_mode") == 0)
             {
                 uint16_t mode = atoi(tokens[2]);
-                bool succ = wifi_set_phy_mode(mode);
-                if (succ)
-                    config.phy_mode = mode;
-                os_sprintf(response, "Phy mode setting %s\r\n",
-                           succ ? "successful" : "failed");
+                if (mode < 1 || mode > 3)
+                {
+                    os_sprintf_flash(response, "Invalid phy_mode (1=b, 2=g, 3=n)\r\n");
+                    goto command_handled;
+                }
+                config.phy_mode = mode;
+                config_save(&config);
+                os_sprintf_flash(response, "Phy mode set, reboot to apply\r\n");
                 goto command_handled;
             }
 #endif