diff --git a/mtkclient/Library/DA/xflash/extension/xflash.py b/mtkclient/Library/DA/xflash/extension/xflash.py
index e833dd90..0d91925a 100755
--- a/mtkclient/Library/DA/xflash/extension/xflash.py
+++ b/mtkclient/Library/DA/xflash/extension/xflash.py
@@ -313,14 +313,20 @@ def cmd(self, cmd):
         return False
 
     def custom_read(self, addr, length):
-        if self.cmd(XCmd.CUSTOM_READ):
-            self.xsend(data=addr, is64bit=True)
-            self.xsend(length)
-            data = self.xread()
-            status = self.status()
-            if status == 0:
-                return data
-        return b""
+        data = bytearray()
+        pos = 0
+        while pos<length:
+            if self.cmd(XCmd.CUSTOM_READ):
+                self.xsend(data=addr+pos, is64bit=True)
+                sz = min(length,0x10000)
+                self.xsend(sz)
+                tmp = self.xread()
+                data.extend(tmp)
+                pos += len(tmp)
+                status = self.status()
+                if status != 0:
+                    break
+        return data[:length]
 
     def custom_readregister(self, addr):
         if self.cmd(XCmd.CUSTOM_READREGISTER):
diff --git a/mtkclient/Library/DA/xflash/xflash_lib.py b/mtkclient/Library/DA/xflash/xflash_lib.py
index afe9720f..119c6d01 100755
--- a/mtkclient/Library/DA/xflash/xflash_lib.py
+++ b/mtkclient/Library/DA/xflash/xflash_lib.py
@@ -66,8 +66,8 @@ def __init__(self, mtk, daconfig, loglevel=logging.INFO):
 
         try:
             from mtkclient.Library.Exploit.kamakiripl import KamakiriPl
-            self.kamakiri_pl = KamakiriPl(self.mtk, loglevel)
-            # self.kamakiri_pl = None
+            # self.kamakiri_pl = KamakiriPl(self.mtk, loglevel)
+            self.kamakiri_pl = None
         except Exception:
             self.kamakiri_pl = None
 
diff --git a/mtkclient/Library/Port.py b/mtkclient/Library/Port.py
index ad8c051e..1e3304b3 100755
--- a/mtkclient/Library/Port.py
+++ b/mtkclient/Library/Port.py
@@ -155,8 +155,7 @@ def handshake(self, maxtries=None, loop=0):
                 if maxtries is not None and counter == maxtries:
                     break
                 counter += 1
-                self.cdc.connected = self.cdc.connect()
-                if self.cdc.connected and self.run_handshake():
+                if self.cdc.connect() and self.run_handshake():
                     return True
                 else:
                     if loop == 5:
diff --git a/mtkclient/Library/mtk_preloader.py b/mtkclient/Library/mtk_preloader.py
index e2828637..2cad03bb 100755
--- a/mtkclient/Library/mtk_preloader.py
+++ b/mtkclient/Library/mtk_preloader.py
@@ -240,6 +240,8 @@ def init(self, maxtries=None, display=True):
                 self.send_auth(authdata)
             else:
                 self.error(f"Couldn't find auth file {self.config.auth}")
+        elif self.config.is_brom and self.config.target_config["daa"]:
+            self.warning("Auth file is required. Use --auth option.")
         if self.config.cert is not None and self.config.is_brom and self.config.target_config["daa"]:
             if os.path.exists(self.config.cert):
                 certdata = open(self.config.cert, "rb").read()
@@ -640,6 +642,7 @@ def send_auth(self, auth):
                     pos += size
                 self.usbwrite(b"")
                 time.sleep(0.035)
+                crc = self.rword()
                 status = self.rword()
                 if 0x0 <= status <= 0xFF:
                     return True
diff --git a/mtkclient/config/brom_config.py b/mtkclient/config/brom_config.py
index af208b1d..ad1fa899 100755
--- a/mtkclient/config/brom_config.py
+++ b/mtkclient/config/brom_config.py
@@ -1418,6 +1418,34 @@ def __init__(self, var1=None, watchdog=None, uart=None, brom_payload_addr=None,
         description="Dimensity 9000/9000+"
         # loader="mt6983_payload.bin"
     ),
+    # Dimensity 7020/930 - MT6855 - Motorola XT2415V
+    0x1129: Chipconfig(
+        var1=0xA,
+        watchdog=0x1c007000,
+        uart=0x11001000,
+        brom_payload_addr=0x100A00,
+        da_payload_addr=0x201000,
+        pl_payload_addr=0x40200000,
+        gcpu_base=0x10050000,
+        dxcc_base=0x10210000,
+        sej_base=0x1000a000,
+        cqdma_base=0x10212000,
+        ap_dma_mem=0x11300800 + 0x1a0,
+        # blacklist=[(0x102848, 0x0), (0x00106B60, 0x0)],
+        # blacklist_count=0x0000000A,
+        # send_ptr=(0x102888, 0xE79C),
+        # ctrl_buffer=0x00102A9C,
+        # cmd_handler=0x0000F569,
+        # brom_register_access=(0xeba4, 0xec5c),
+        meid_addr=0x1008EC,
+        socid_addr=0x100934,
+        # prov_addr=0x1066C0,
+        damode=DAmodes.XML,
+        dacode=0x1129,
+        name="MT6855",
+        description="Dimensity 8100"
+        # loader="mt6893_payload.bin"
+    ),
     # Dimensity 1100 - MT6895 Dimensity 8200 - Vivo V27 Pro
     0x1172: Chipconfig(
         var1=0xA,
@@ -1441,7 +1469,7 @@ def __init__(self, var1=None, watchdog=None, uart=None, brom_payload_addr=None,
         socid_addr=0x100934,
         # prov_addr=0x1066C0,
         damode=DAmodes.XML,
-        dacode=0x6895,
+        dacode=0x1172,
         name="MT6895",
         description="Dimensity 8100"
         # loader="mt6893_payload.bin"