I update_engine: [0530/162336:INFO:delta_performer.cc(359)] Applying 21701 operations to partition "system"
E update_engine: [0530/162336:ERROR:delta_performer.cc(1060)] The hash of the source data on disk for this operation doesn't match the expected value. This could mean that the delta update payload was targeted for another version, or that the source partition was modified after it was installed, for example, by mounting a filesystem.
E update_engine: [0530/162336:ERROR:delta_performer.cc(1065)] Expected:   sha256|hex = 839ACF5296B9AB820DC822B6C09EBA896905531EB2C581093A357411F1A444A0
E update_engine: [0530/162336:ERROR:delta_performer.cc(1068)] Calculated: sha256|hex = 18AF8D6842A71554893F1DE65B87F2A9639FB390357C71D5383C6ED7A6051AFA
E update_engine: [0530/162336:ERROR:delta_performer.cc(1077)] Operation source (offset:size) in blocks: 0:2,193:1,218:456,23471:8,32769:1,32961:1,37333:4,37351:3,37554:3,37570:2,37951:1,37959:1,38111:1,38125:1,38129:1,38139:1,38147:1,38149:1,38151:2,38155:1,38157:1,38360:5,38372:1,38377:5,38384:1,38437:1,38442:1,38447:1,38452:1,38457:1,38462:1,38467:1
E update_engine: [0530/162336:ERROR:delta_performer.cc(1260)] ValidateSourceHash(source_hasher.raw_hash(), operation, error) failed.
E update_engine: [0530/162336:ERROR:delta_performer.cc(283)] Failed to perform SOURCE_BSDIFF operation 8, which is the operation 0 in partition "system"
E update_engine: [0530/162336:ERROR:download_action.cc(273)] Error 20 in DeltaPerformer's Write method when processing the received payload -- Terminating processing
I update_engine: [0530/162336:INFO:delta_performer.cc(299)] Discarding 113721 unused downloaded bytes
I update_engine: [0530/162336:INFO:multi_range_http_fetcher.cc(171)] Received transfer terminated.
I update_engine: [0530/162336:INFO:multi_range_http_fetcher.cc(123)] TransferEnded w/ code 200
I update_engine: [0530/162336:INFO:multi_range_http_fetcher.cc(125)] Terminating.
I update_engine: [0530/162336:INFO:action_processor.cc(116)] ActionProcessor: finished DownloadAction with code ErrorCode::kDownloadStateInitializationError
I update_engine: [0530/162336:INFO:action_processor.cc(121)] ActionProcessor: Aborting processing due to failure.
I update_engine: [0530/162336:INFO:update_attempter_android.cc(286)] Processing Done.
I update_engine: [0530/162336:INFO:update_attempter_android.cc(306)] Resetting update progress.

验证是否如上原因导致:
    将整包中system.img通过fastboot烧录到当前系统,再验证差分包升级
    adb reboot bootloader
    fastboot devices 
    //切换到system.img所在的目录
    fastboot flash system system.img
    fastboot reboot

$(hide) ./build/tools/releasetools/replace_img_from_target_files.py $@ $(PRODUCT_OUT)

#!/usr/bin/env python
#
# Copyright (C) 2014 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
 
"""
Given a target-files zipfile that does contain images (ie, does
have an IMAGES/ top-level subdirectory), replace the images to
the output dir.
Usage:  replace_img_from_target_files target_files output
"""
 
import sys
 
if sys.hexversion < 0x02070000:
  print >> sys.stderr, "Python 2.7 or newer is required."
  sys.exit(1)
 
import errno
import os
import re
import shutil
import subprocess
import tempfile
import zipfile
 
image_replace_list = ["boot.img","system.img"]
 
# missing in Python 2.4 and before
if not hasattr(os, "SEEK_SET"):
  os.SEEK_SET = 0
 
def main(argv):
 
  if len(argv) != 2:
    sys.exit(1)
 
  if not os.path.exists(argv[0]):
    print "Target file:%s is invalid" % argv[0]
    sys.exit(1)
 
  if not os.path.exists(argv[1]):
    print "Output dir:%s is invalid" % argv[1]
    sys.exit(1)
 
  zf = zipfile.ZipFile(argv[0], 'r')
 
  for img in zf.namelist():
    if img.find("IMAGES/") != -1:
      if img.find(".img") != -1:
        data = zf.read(img)
        name = img.replace("IMAGES/", '')
        if name in image_replace_list:
          print "Replace %s" % name
          name = '/'.join((argv[1], name))
          file = open(name, "w")
          file.write(data)
          file.close()
 
if __name__ == '__main__':
  main(sys.argv[1:])