diff --git a/zephcore/app/CompanionMesh.cpp b/zephcore/app/CompanionMesh.cpp
index 3776978..309afd7 100644
--- a/zephcore/app/CompanionMesh.cpp
+++ b/zephcore/app/CompanionMesh.cpp
@@ -1836,7 +1836,7 @@ bool CompanionMesh::handleProtocolFrame(const uint8_t *data, size_t len)
 			uint8_t rsp[81];
 			rsp[0] = PACKET_DEVICE_INFO;
 			rsp[1] = 9;  // FIRMWARE_VER_CODE - v9 = client_repeat support
-			rsp[2] = MAX_CONTACTS / 2;
+			rsp[2] = (MAX_CONTACTS / 2 > 255) ? 255 : (MAX_CONTACTS / 2);  // protocol byte, app multiplies by 2
 			rsp[3] = MAX_GROUP_CHANNELS;
 			put_le32(&rsp[4], prefs.ble_pin ? prefs.ble_pin : 123456);  // BLE PIN
 			memcpy(&rsp[8], fw_build, 12);
diff --git a/zephcore/boards/common/prod.conf b/zephcore/boards/common/prod.conf
index f5ffb8f..04d15b7 100644
--- a/zephcore/boards/common/prod.conf
+++ b/zephcore/boards/common/prod.conf
@@ -11,6 +11,6 @@ CONFIG_LOG=n
 # Disable asserts (saves flash, removes CMake warning)
 CONFIG_ASSERT=n
 
-# Max contacts for production (Check board configs for overrides, too low RAM can freeze the device with this setting!)
-# nRF/ESP like RAK and Wio Tracker / S3,C6 should handle it.
-CONFIG_ZEPHCORE_MAX_CONTACTS=750
+# Max contacts for production (App protocol limit: 510, encoded as uint8 * 2, so you can set it higher, but the current app can't display it or work with it)
+# Check board configs for overrides — too low RAM can freeze the device.
+CONFIG_ZEPHCORE_MAX_CONTACTS=510