diff --git a/CanUds.c b/CanUds.c
index 48c2962..a7442b4 100644
--- a/CanUds.c
+++ b/CanUds.c
@@ -14,6 +14,7 @@
 #include "fc7xxx_driver_flash.h"
 #include "DownloadFile.h"
 #include "crc32_uds.h"
+#include "EraseMemory.h"
 
 #define LOG_SIGN "CAN_UDS"
 #define LOGGER env->logger
@@ -975,8 +976,7 @@ static uint16_t vUDS_routine_Compare_Checksum(tCanUds *env, eUdsRoutineControlTy
 
     setResponseErrorPending(env, UDS_RoutineControl, UDS_error_requestCorrectlyReceived_ResponsePending);
 
-    uint32_t crc32_calc = UdsCrc32Update(0xFFFFFFFF, (uint8_t *)env->BlockMainAdr1, env->BlockMainSize1);
-    crc32_calc = UdsCrc32Update(crc32_calc, (uint8_t *)env->BlockMainAdr2, env->BlockMainSize2);
+    uint32_t crc32_calc = UdsCrc32Update(0xFFFFFFFF, (uint8_t *) env->CurrentBlockAdr, env->CurrentBlockSize);
     crc32_calc = UdsCrc32Finalize(crc32_calc);
 
     uint32_t crc32_received =
@@ -999,12 +999,21 @@ static uint16_t vUDS_routine_Erase_Memory(tCanUds *env, eUdsRoutineControlType u
         return 0xFF00 | UDS_error_sub_functionNotSupported;
     }
 
+    if (env->data->len < 13) {
+        return setResponseError(env, UDS_Communication_Control,
+                                UDS_error_incorrectMessageLengthOrInvalidFormat);
+    }
+
+    tEraseMemory *eraseMemory = (tEraseMemory *) env->data->data;
+
     env->udsBlock = UDS_BlockInit;
 
-    if ((env->data->data[4] == 0) && ((env->data->data[5] == 0))) {
+    if (eraseMemory->memoryAddress == 0x01100000) {
         env->udsBlock = UDS_BlockMain;
-    } else if ((env->data->data[4] == 1) && ((env->data->data[5] == 0))) {
+    } else if (eraseMemory->memoryAddress == 0x011B0000) {
         env->udsBlock = UDS_BlockCalib;
+    } else if (eraseMemory->memoryAddress == 0x011DEC00) {
+        env->udsBlock = UDS_BlockMeta;
     }
 
     if (env->udsBlock == UDS_BlockInit) {
@@ -1013,23 +1022,23 @@ static uint16_t vUDS_routine_Erase_Memory(tCanUds *env, eUdsRoutineControlType u
 
     setResponseErrorPending(env, UDS_RoutineControl, UDS_error_requestCorrectlyReceived_ResponsePending);
 
-    bool resultMain = false;
-    bool resultMeta = false;
+    bool result = false;
 
     if (env->udsBlock == UDS_BlockMain) {
-        resultMain = env->clear_flash_func(0x01100000, 704 * 1024);
-        uint32_t adrMeta = 0x01100000 + 704 * 1024 - 2048;
-        resultMeta = env->clear_flash_func(adrMeta, 2048);
+        result = env->clear_flash_func(0x01100000, 704 * 1024);
     }
 
     if (env->udsBlock == UDS_BlockCalib) {
-        resultMain = env->clear_flash_func(0x011B0000, 192 * 1024);
-        resultMeta = true;
+        result = env->clear_flash_func(0x011B0000, 192 * 1024 - 2048);
+    }
+
+    if (env->udsBlock == UDS_BlockMeta) {
+        result = env->clear_flash_func(0x011DF800, 2048);
     }
 
 //    bool result = FLASHDRIVER_FlashEraseBlock(FLASH_BLOCK_SELECT1);
 
-    if ((resultMain) && (resultMeta)) {
+    if (result) {
         env->dataResponse[4] =
                 UDS_routine_RoutineStartStopSuccess;
     } else {
@@ -1336,15 +1345,20 @@ static uint16_t RequestDownload_34(tCanUds *env) {
         return setResponseError(env, UDS_RequestDownload, UDS_error_incorrectMessageLengthOrInvalidFormat);
     }
 
-    if ((com->dataFormatIdentifier != 0) && (com->dataFormatIdentifier != 1)) {
+    if (com->dataFormatIdentifier != 0) {
         return setResponseError(env, UDS_RequestDownload, UDS_error_requestOutOfRange);
     }
 
-    if (com->dataFormatIdentifier == 0) {
+
+    if (com->memoryAddress == 0x01020000) {
         env->udsBlock = UDS_BlockMain;
     }
 
-    if (com->dataFormatIdentifier == 1) {
+    if (com->memoryAddress == 0x010D0000) {
+        env->udsBlock = UDS_BlockCalib;
+    }
+
+    if (com->memoryAddress == 0x010FF800) {
         env->udsBlock = UDS_BlockCalib;
     }
 
@@ -1355,43 +1369,25 @@ static uint16_t RequestDownload_34(tCanUds *env) {
 
     if (env->udsBlock == UDS_BlockMain) {
 
-        if ((com->memoryAddress != 0x01020000) && (com->memoryAddress != 0x010FF800)) {
+        if ((com->memoryAddress != 0x01020000) && (com->memorySize > (704 * 1024))) {
             return setResponseError(env, UDS_RequestDownload, UDS_error_requestOutOfRange);
         }
-
-        if ((com->memoryAddress == 0x01020000) && (com->memorySize > (704 * 1024))) {
-            return setResponseError(env, UDS_RequestDownload, UDS_error_requestOutOfRange);
-        }
-
-        if ((com->memoryAddress == 0x010FF800) && (com->memorySize > (2 * 1024))) {
-            return setResponseError(env, UDS_RequestDownload, UDS_error_requestOutOfRange);
-        }
-
-        if (com->memoryAddress == 0x01020000) {
-            env->BlockMainAdr1 = env->AdrFlash;
-            env->BlockMainSize1 = env->DownloadFirmwareSize;
-        }
-
-        if (com->memoryAddress == 0x010FF800) {
-            env->BlockMainAdr2= env->AdrFlash;
-            env->BlockMainSize2 = env->DownloadFirmwareSize;
-        }
-
     }
 
     if (env->udsBlock == UDS_BlockCalib) {
 
-        if (com->memoryAddress != 0x010D0000) {
+        if ((com->memoryAddress != 0x010D0000) || (com->memorySize > (192 * 1024 - 2048))){
             return setResponseError(env, UDS_RequestDownload, UDS_error_requestOutOfRange);
         }
 
-        if (com->memorySize > (192 * 1024 - 2048)) {
+    }
+
+    if (env->udsBlock == UDS_BlockMeta) {
+
+        if ((com->memoryAddress != 0x010FF800) || (com->memorySize > (2 * 1024))) {
             return setResponseError(env, UDS_RequestDownload, UDS_error_requestOutOfRange);
         }
 
-        env->BlockCalibAdr1 = env->AdrFlash;
-        env->BlockCalibSize1 = env->DownloadFirmwareSize;
-
     }
 
     if (env->currentSession == UDS_session_defaultSession) {
@@ -1402,6 +1398,9 @@ static uint16_t RequestDownload_34(tCanUds *env) {
         return setResponseError(env, UDS_RoutineControl, UDS_error_securityAccessDenied);
     }
 
+    env->CurrentBlockAdr = env->AdrFlash;
+    env->CurrentBlockSize = env->DownloadFirmwareSize;
+
     tRequestDownload_Response *requestDownload_Response = (tRequestDownload_Response *) env->dataResponse;
     requestDownload_Response->ServiceId = UDS_RequestDownload | 0b1000000;
     requestDownload_Response->lengthFormatIdentifier = 0x20; // 2 байта - длина поля maxNumberOfBlockLength
@@ -1411,7 +1410,8 @@ static uint16_t RequestDownload_34(tCanUds *env) {
 
 
 #if (LOG_UDS == 1)
-    LoggerFormatInfo(LOGGER, LOG_SIGN, "RequestDownload: memoryAddress = %d memorySize = %d ", env->AdrFlash, env->DownloadFirmwareSize)
+    LoggerFormatInfo(LOGGER, LOG_SIGN, "RequestDownload: memoryAddress = %d memorySize = %d ", env->AdrFlash,
+                     env->DownloadFirmwareSize)
 #endif
 
     env->stateDownload = UDS_RequestDownload;
@@ -1481,7 +1481,7 @@ static uint16_t TransferData_36(tCanUds *env) {
 
 #if (LOG_UDS == 1)
     LoggerFormatInfo(LOGGER, LOG_SIGN, "Download: %d of %d kb", env->SizeWriteFlash / 1024,
-                      env->DownloadFirmwareSize / 1024)
+                     env->DownloadFirmwareSize / 1024)
 #endif
 
 
@@ -1513,7 +1513,6 @@ static uint16_t RequestTransferExit_37(tCanUds *env) {
     }
 
 
-
     tRequestTransferExit_Request *com = (tRequestTransferExit_Request *) env->data->data;
 
     tRequestTransferExit_Response *requestTransferExit_Response = (tRequestTransferExit_Response *) env->dataResponse;
@@ -1830,7 +1829,7 @@ void CanUds(tCanUds *env) {
 
 #if (LOG_UDS == 1)
                 LoggerFormatInfo(LOGGER, LOG_SIGN, "Resetting the session to default: %d",
-                                  UDS_session_defaultSession)
+                                 UDS_session_defaultSession)
 #endif
                 setDefaultSecurityAccess(env);
                 set_CCU_Mute(env->canSpamTransmitter, false);
diff --git a/CanUds.h b/CanUds.h
index a20aaa1..7b8cd2a 100644
--- a/CanUds.h
+++ b/CanUds.h
@@ -138,6 +138,7 @@ typedef enum {
 typedef enum {
     UDS_BlockMain = 0,
     UDS_BlockCalib = 1,
+    UDS_BlockMeta = 2,
     UDS_BlockInit = 0xff
 } eUdsBlock;
 
@@ -197,13 +198,8 @@ typedef struct {
     uint32_t DownloadFirmwareSize;
     eUdsBlock udsBlock;
 
-    uint32_t BlockMainAdr1;
-    uint32_t BlockMainSize1;
-    uint32_t BlockMainAdr2;
-    uint32_t BlockMainSize2;
-
-    uint32_t BlockCalibAdr1;
-    uint32_t BlockCalibSize1;
+    uint32_t CurrentBlockAdr;
+    uint32_t CurrentBlockSize;
 
 
     eUdsServices stateDownload;
diff --git a/EraseMemory.h b/EraseMemory.h
new file mode 100644
index 0000000..6e860eb
--- /dev/null
+++ b/EraseMemory.h
@@ -0,0 +1,23 @@
+//
+// Created by cfif on 26.05.2026.
+//
+
+#ifndef HVAC_M7_ERASEMEMORY_H
+#define HVAC_M7_ERASEMEMORY_H
+
+#include "stdint.h"
+
+#pragma scalar_storage_order big-endian
+
+typedef struct __attribute__ ((packed)) {
+    uint8_t ServiceId;
+    uint8_t RouteControlType;
+    uint16_t RoutineIdentifier;
+    uint8_t addressAndLengthFormatIdentifier;
+    uint32_t memoryAddress;
+    uint32_t memorySize;
+} tEraseMemory;
+
+#pragma scalar_storage_order little-endian
+
+#endif //HVAC_M7_ERASEMEMORY_H