diff --git a/arduino/libretuya/core/ChipType.h b/arduino/libretuya/core/ChipType.h
index b3e9073..6488c82 100644
--- a/arduino/libretuya/core/ChipType.h
+++ b/arduino/libretuya/core/ChipType.h
@@ -21,7 +21,8 @@ enum ChipType {
 	RTL8710BL = CHIP_TYPE(F_RTL8710B, 0xE0), // ???
 	RTL8710BN = CHIP_TYPE(F_RTL8710B, 0xFF), // CHIPID_8710BN / QFN32
 	RTL8710BU = CHIP_TYPE(F_RTL8710B, 0xFE), // CHIPID_8710BU / QFN48
-	RTL8710BX = CHIP_TYPE(F_RTL8710B, 0xFB), // CHIPID_8710BN_L0 / QFN32
+	RTL8710BX = CHIP_TYPE(F_RTL8710B, 0xF6), // found on an actual RTL8710BX
+	RTL8710L0 = CHIP_TYPE(F_RTL8710B, 0xFB), // CHIPID_8710BN_L0 / QFN32
 	RTL8711BN = CHIP_TYPE(F_RTL8710B, 0xFD), // CHIPID_8711BN / QFN48
 	RTL8711BU = CHIP_TYPE(F_RTL8710B, 0xFC), // CHIPID_8711BG / QFN68
 };
diff --git a/boards/_base/realtek-ambz-bx.json b/boards/_base/realtek-ambz-bx.json
new file mode 100644
index 0000000..7e565e2
--- /dev/null
+++ b/boards/_base/realtek-ambz-bx.json
@@ -0,0 +1,5 @@
+{
+	"build": {
+		"f_cpu": "62500000L"
+	}
+}
diff --git a/boards/bw12.json b/boards/bw12.json
index 6817d27..c0011fb 100644
--- a/boards/bw12.json
+++ b/boards/bw12.json
@@ -2,6 +2,7 @@
 	"_base": [
 		"realtek-ambz",
 		"realtek-ambz-2mb-small",
+		"realtek-ambz-bx",
 		"pcb/ic-rtl8710bn",
 		"pcb/bw12"
 	],
diff --git a/boards/bw12/README.md b/boards/bw12/README.md
index 5855e13..57bd62c 100644
--- a/boards/bw12/README.md
+++ b/boards/bw12/README.md
@@ -14,7 +14,7 @@ Parameter    | Value
 MCU          | RTL8710BX
 Manufacturer | Realtek
 Series       | AmebaZ
-Frequency    | 125 MHz
+Frequency    | 62.5 MHz
 Flash size   | 2 MiB
 RAM size     | 256 KiB
 Voltage      | 3.0V - 3.6V