diff --git a/.travis.yml b/.travis.yml
index 03a923a4..bea38bfc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,12 +11,12 @@ cache:
   - directories:
     - cache
 before_install:
-- pip install --user hererocks
+- pip install --user hererocks esptool
 - hererocks env --lua 5.1 -rlatest
 - source env/bin/activate
 - luarocks install luafilesystem
 install:
-- tar -zxvf tools/esp-open-sdk.tar.gz
+- tar -Jxvf tools/esp-open-sdk.tar.xz
 - export PATH=$PATH:$PWD/esp-open-sdk/xtensa-lx106-elf/bin
 script:
 - lua tools/cross-lua.lua || exit 1
diff --git a/tools/esp-open-sdk.tar.gz b/tools/esp-open-sdk.tar.gz
deleted file mode 100644
index 860ef4bc..00000000
Binary files a/tools/esp-open-sdk.tar.gz and /dev/null differ
diff --git a/tools/esp-open-sdk.tar.xz b/tools/esp-open-sdk.tar.xz
new file mode 100644
index 00000000..8027f504
Binary files /dev/null and b/tools/esp-open-sdk.tar.xz differ
diff --git a/tools/pr-build.sh b/tools/pr-build.sh
index 7f715479..361dd4ab 100644
--- a/tools/pr-build.sh
+++ b/tools/pr-build.sh
@@ -19,11 +19,6 @@ sed -E -i.bak 's@// ?#define DEVELOP_VERSION@#define DEVELOP_VERSION@' user_conf
 sed -i 's@//#define BUILD_FATFS@#define BUILD_FATFS@' user_config.h
 cat user_config.h
 
-cd "$TRAVIS_BUILD_DIR"/ld || exit
-# increase irom0_0_seg size for all modules build
-sed -E -i.bak 's@(.*irom0_0_seg *:.*len *=) *[^,]*(.*)@\1 0xD0000\2@' nodemcu.ld
-cat nodemcu.ld
-
 # change to "root" directory no matter where the script was started from
 cd "$TRAVIS_BUILD_DIR" || exit
 make clean