getprop("ro.product.device") == "merlin" || abort("E3004: This package is for \"merlin\" devices; this is a \"" + getprop("ro.product.device") + "\".");
ui_print("Source: Redmi/merlin/merlin:10/QP1A.190711.020/V12.0.4.0.QJOCNXM:user/release-keys");
ui_print("Target: Redmi/merlin/merlin:10/QP1A.190711.020/V12.0.5.0.QJOCNXM:user/release-keys");
ui_print("Verifying current system...");
getprop("ro.build.fingerprint") == "Redmi/merlin/merlin:10/QP1A.190711.020/V12.0.4.0.QJOCNXM:user/release-keys" ||
    getprop("ro.build.fingerprint") == "Redmi/merlin/merlin:10/QP1A.190711.020/V12.0.5.0.QJOCNXM:user/release-keys" ||
    abort("E3001: Package expects build fingerprint of Redmi/merlin/merlin:10/QP1A.190711.020/V12.0.4.0.QJOCNXM:user/release-keys or Redmi/merlin/merlin:10/QP1A.190711.020/V12.0.5.0.QJOCNXM:user/release-keys; this device has " + getprop("ro.build.fingerprint") + ".");
show_progress(0.100000, 10);
patch_partition_check("EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:cce102fabc363d8ee2861ba6e364d31a51dba3d4",
                      "EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:b4ee040fd6c1a6312cf1c46dee36af02a348f32c") ||
    abort("E3005: \"EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:cce102fabc363d8ee2861ba6e364d31a51dba3d4\" or \"EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:b4ee040fd6c1a6312cf1c46dee36af02a348f32c\" has unexpected contents.");
apply_patch_space(138702848) || abort("E3006: Not enough free space on /cache to apply patches.");
patch_partition_check("EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:35f80a17eedd52337dc592653707859d82e4bc83",
                      "EMMC:/dev/block/platform/bootdevice/by-name/md1img:57563440:f7ae51c816cd948388cb36964cd5fa0ff117557c") ||
    abort("E3005: \"EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:35f80a17eedd52337dc592653707859d82e4bc83\" or \"EMMC:/dev/block/platform/bootdevice/by-name/md1img:57563440:f7ae51c816cd948388cb36964cd5fa0ff117557c\" has unexpected contents.");
apply_patch_space(58082656) || abort("E3006: Not enough free space on /cache to apply patches.");
show_progress(0.100000, 70);
if (range_sha1(map_partition("system"), "72,1,32770,32961,59066,59149,59153,59159,59160,64779,64781,65536,65552,65860,65861,70168,70169,70444,70448,70460,70461,70471,70475,70479,70480,70493,70497,70513,70514,70519,70520,70826,70830,70841,70842,71464,71468,71484,71485,71658,71662,71669,71670,73205,73209,73246,73247,73618,74031,75646,75647,76568,76572,76597,76598,83317,83321,83439,98306,98497,163842,164033,229378,229569,294914,295105,753678,753680,783196,785568,798016,798181,798182") == "fbd1ca7f25054257196c2efdba87db2739a441b3" || block_image_verify(map_partition("system"), package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat")) then
ui_print("Verified system image...");
else
check_first_block(map_partition("system"));
ifelse (block_image_recover(map_partition("system"), "72,1,32770,32961,59066,59149,59153,59159,59160,64779,64781,65536,65552,65860,65861,70168,70169,70444,70448,70460,70461,70471,70475,70479,70480,70493,70497,70513,70514,70519,70520,70826,70830,70841,70842,71464,71468,71484,71485,71658,71662,71669,71670,73205,73209,73246,73247,73618,74031,75646,75647,76568,76572,76597,76598,83317,83321,83439,98306,98497,163842,164033,229378,229569,294914,295105,753678,753680,783196,785568,798016,798181,798182") && block_image_verify(map_partition("system"), package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat"), ui_print("system recovered successfully."), abort("E1004: system partition fails to recover"));
endif;
if (range_sha1(map_partition("vendor"), "16,1,32770,32819,48026,50867,98306,98355,163842,163891,196624,196631,200473,201087,204277,204331,204332") == "e4d1a39bfdae827205bc36cbfc7c33e4be0b42d3" || block_image_verify(map_partition("vendor"), package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat")) then
ui_print("Verified vendor image...");
else
check_first_block(map_partition("vendor"));
ifelse (block_image_recover(map_partition("vendor"), "16,1,32770,32819,48026,50867,98306,98355,163842,163891,196624,196631,200473,201087,204277,204331,204332") && block_image_verify(map_partition("vendor"), package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat"), ui_print("vendor recovered successfully."), abort("E2004: vendor partition fails to recover"));
endif;
if (range_sha1(map_partition("product"), "8,1,32770,32781,48361,48509,49281,49307,49308") == "d81463d8d3bc8ae80c1aeaf863b62e35bef90912" || block_image_verify(map_partition("product"), package_extract_file("product.transfer.list"), "product.new.dat", "product.patch.dat")) then
ui_print("Verified product image...");
else
ifelse (block_image_recover(map_partition("product"), "8,1,32770,32781,48361,48509,49281,49307,49308") && block_image_verify(map_partition("product"), package_extract_file("product.transfer.list"), "product.new.dat", "product.patch.dat"), ui_print("product recovered successfully."), abort("E2004: product partition fails to recover"));
endif;

# ---- start making changes here ----

ui_print("Patching boot image...");
show_progress(0.100000, 10);
patch_partition("EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:cce102fabc363d8ee2861ba6e364d31a51dba3d4",
                "EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:b4ee040fd6c1a6312cf1c46dee36af02a348f32c",
                package_extract_file("boot.img.p")) ||
    abort("E3008: Failed to apply patch to EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:b4ee040fd6c1a6312cf1c46dee36af02a348f32c");
show_progress(0.600000, 600);

# --- Start patching dynamic partitions ---


# Patch partition vendor

ui_print("Patching vendor image after verification.");
block_image_update(map_partition("vendor"), package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat") ||
  abort("E2001: Failed to update vendor image.");

# Update dynamic partition metadata

assert(update_dynamic_partitions(package_extract_file("dynamic_partitions_op_list")));

# Patch partition product

ui_print("Patching product image after verification.");
block_image_update(map_partition("product"), package_extract_file("product.transfer.list"), "product.new.dat", "product.patch.dat") ||
  abort("E2001: Failed to update product image.");

# Patch partition system

ui_print("Patching system image after verification.");
block_image_update(map_partition("system"), package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat") ||
  abort("E1001: Failed to update system image.");

# --- End patching dynamic partitions ---

show_progress(0.100000, 2);
show_mtupdate_stage("/cache/recovery/last_mtupdate_stage");
ifelse (
less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "1") ,
(
ui_print("start to update general image");
package_extract_file("logo.bin", "/dev/block/platform/bootdevice/by-name/logo");
package_extract_file("dtbo.img", "/dev/block/platform/bootdevice/by-name/dtbo");
package_extract_file("exaid.img", "/dev/block/platform/bootdevice/by-name/exaid");
ui_print("Patching md1img image...");
show_progress(0.100000, 10);
patch_partition("EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:35f80a17eedd52337dc592653707859d82e4bc83",
                "EMMC:/dev/block/platform/bootdevice/by-name/md1img:57563440:f7ae51c816cd948388cb36964cd5fa0ff117557c",
                package_extract_file("patch/md1img.img.p")) ||
    abort("E3008: Failed to apply patch to EMMC:/dev/block/platform/bootdevice/by-name/md1img:57563440:f7ae51c816cd948388cb36964cd5fa0ff117557c");
package_extract_file("spmfw.img", "/dev/block/platform/bootdevice/by-name/spmfw");
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "1");
),
ui_print("general images are already updated");
);
ifelse (
less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "3") ,
(
if less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "2") then

ui_print("start to update alt loader image");
package_extract_file("sspm.img", "/dev/block/platform/bootdevice/by-name/sspm_2");
package_extract_file("scp.img", "/dev/block/platform/bootdevice/by-name/scp2");
package_extract_file("lk.img", "/dev/block/platform/bootdevice/by-name/lk2");
package_extract_file("tee.img", "/dev/block/platform/bootdevice/by-name/tee2");
if get_storage_type() then 
 assert(package_extract_file("preloader_ufs.img", "/dev/block/mmcblk0boot1"));
else 
 assert(set_emmc_writable("/sys/block/mmcblk0boot1/force_ro"),
        package_extract_file("preloader_emmc.img", "/dev/block/mmcblk0boot1"));
endif;
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "2");
endif;

switch_active("sspm_1", "sspm_2");
switch_active("scp1", "scp2");
switch_active("lk", "lk2");
switch_active("tee1", "tee2");
switch_active("preloader", "preloader2");
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "3");
),
ui_print("alt loder images are already updated");
);
ifelse (
less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "5") ,
(
if less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "4") then

ui_print("start to update main loader image");
package_extract_file("sspm.img", "/dev/block/platform/bootdevice/by-name/sspm_1");
package_extract_file("scp.img", "/dev/block/platform/bootdevice/by-name/scp1");
package_extract_file("lk.img", "/dev/block/platform/bootdevice/by-name/lk");
package_extract_file("tee.img", "/dev/block/platform/bootdevice/by-name/tee1");
if get_storage_type() then 
 assert(package_extract_file("preloader_ufs.img", "/dev/block/mmcblk0boot0"));
else 
 assert(set_emmc_writable("/sys/block/mmcblk0boot0/force_ro"),
        package_extract_file("preloader_emmc.img", "/dev/block/mmcblk0boot0"));
endif;
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "4");
endif;

switch_active("sspm_2", "sspm_1");
switch_active("scp2", "scp1");
switch_active("lk2", "lk");
switch_active("tee2", "tee1");
switch_active("preloader2", "preloader");
),
ui_print("main loader images are already updated");
);
delete("/cache/recovery/last_mtupdate_stage");
package_extract_file("vbmeta_system.img", "/dev/block/platform/bootdevice/by-name/vbmeta_system");
package_extract_file("vbmeta.img", "/dev/block/platform/bootdevice/by-name/vbmeta");
package_extract_file("vbmeta_vendor.img", "/dev/block/platform/bootdevice/by-name/vbmeta_vendor");
post_ota_action();
