diff --git a/app/Classes/Protocol/Zmodem.php b/app/Classes/Protocol/Zmodem.php
index 500c0ca..f8d65be 100644
--- a/app/Classes/Protocol/Zmodem.php
+++ b/app/Classes/Protocol/Zmodem.php
@@ -1066,6 +1066,82 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 		return $crc32 ? $this->ls_zrecvdata32($data,$len,$timeout) : $this->ls_zrecvdata16($data,$len,$timeout);
 	}
 
+	/**
+	 * Receive data subframe with CRC16, return frame type or error (may be -- timeout)
+	 *
+	 * @return mixed
+	 */
+	private function ls_recvdata16(string &$data,int &$len,int $timeout): int
+	{
+		if ($this->DEBUG)
+			Log::debug('+ Start',['m'=>__METHOD__,'d'=>$data]);
+
+		$got = 0;							/* Bytes total got */
+		$incrc = self::LSZ_INIT_CRC16;		/* Calculated CRC */
+		$crc = 0;							/* Received CRC */
+		$frametype = self::LSZ_ERROR;		/* Type of frame - ZCRC(G|W|Q|E) */
+		$rcvdata = 1;						/* Data is being received NOW (not CRC) */
+
+		while ($rcvdata && (($c = $this->ls_readzdle($timeout)) >= 0)) {
+			if($c < 256) {
+				$data .= chr($c&0xff);
+
+				if (++$got > $this->ls_MaxBlockSize)
+					return self::LSZ_BADCRC;
+
+				$incrc = $this->CRC16USD_UPDATE($c,$incrc);
+
+			} else {
+				switch($c) {
+					case self::LSZ_CRCE:
+					case self::LSZ_CRCG:
+					case self::LSZ_CRCQ:
+					case self::LSZ_CRCW:
+						$rcvdata = 0;
+						$frametype = ($c & 0xff);
+
+						$incrc = $this->CRC16USD_UPDATE($c,$incrc);
+
+						break;
+
+					default:
+						return self::LSZ_BADCRC;
+				}
+			}
+		}
+
+		/* We finish loop by error in ls_readzdle() */
+		if ($rcvdata) {
+			Log::error(sprintf('%s:   ? Something strange or timeout [%d]',__METHOD__,$rc));
+
+			return $c;
+		}
+
+		/* Loops ar unrolled */
+		if (($c = $this->ls_readzdle($timeout)) < 0)
+			return $c;
+
+		$crc = $c;
+		if (($c = $this->ls_readzdle($timeout)) < 0)
+			return $c;
+
+		$crc <<= 8;
+		$crc |= $c;
+
+		if ($this->DEBUG)
+			Log::debug(sprintf('CRC%d got %08x - calculated %08x',16,$incrc,$crc),['m'=>__METHOD__]);
+
+		if ($incrc != $crc)
+			return self::LSZ_BADCRC;
+
+		$len = $got;
+
+		if ($this->DEBUG)
+			Log::debug('= End',['m'=>__METHOD__,'frametype'=>$frametype]);
+
+		return $frametype;
+	}
+
 	/**
 	 * Receive data subframe with CRC32, return frame type or error (may be -- timeout)
 	 *