I imported magento 1.7 orders into magento 2.5 but getting error while view order in admin panel.
1 exception(s): Exception #0 (InvalidArgumentException): Unable to unserialize value. Exception #0 (InvalidArgumentException): Unable to unserialize value. #0 /var/www/html/bpmsport/vendor/magento/framework/Model/ResourceModel/AbstractResource.php(153): Magento\Framework\Serialize\Serializer\Json->unserialize('a:2:{s:15:"info...') #1 /var/www/html/bpmsport/vendor/magento/framework/Model/ResourceModel/Db/AbstractDb.php(505): Magento\Framework\Model\ResourceModel\AbstractResource->_unserializeField(Object(Magento\Sales\Model\Order\Item\Interceptor), 'product_options', Array) #2 /var/www/html/bpmsport/vendor/magento/module-sales/Model/ResourceModel/Order/Item/Collection.php(62): Magento\Framework\Model\ResourceModel\Db\AbstractDb->unserializeFields(Object(Magento\Sales\Model\Order\Item\Interceptor)) #3 /var/www/html/bpmsport/vendor/magento/framework/Data/Collection/AbstractDb.php(588): Magento\Sales\Model\ResourceModel\Order\Item\Collection->_afterLoad() #4 /var/www/html/bpmsport/vendor/magento/framework/Data/Collection/AbstractDb.php(559): Magento\Framework\Data\Collection\AbstractDb->loadWithFilter(false, false) #5 /var/www/html/bpmsport/vendor/magento/framework/Data/Collection.php(831): Magento\Framework\Data\Collection\AbstractDb->load() #6 /var/www/html/bpmsport/vendor/magento/module-sales/Model/Order.php(1271): Magento\Framework\Data\Collection->getIterator() #7 /var/www/html/bpmsport/generated/code/Magento/Sales/Model/Order/Interceptor.php(622): Magento\Sales\Model\Order->getItemsCollection(Array, false) #8 /var/www/html/bpmsport/vendor/magento/module-sales/Model/Order.php(1947): Magento\Sales\Model\Order\Interceptor->getItemsCollection() #9 /var/www/html/bpmsport/generated/code/Magento/Sales/Model/Order/Interceptor.php(1233): Magento\Sales\Model\Order->getItems() #10 /var/www/html/bpmsport/vendor/magento/module-sales/Model/Order/ShippingAssignmentBuilder.php(86): Magento\Sales\Model\Order\Interceptor->getItems() #11 /var/www/html/bpmsport/vendor/magento/module-sales/Model/OrderRepository.php(198): Magento\Sales\Model\Order\ShippingAssignmentBuilder->create() #12 /var/www/html/bpmsport/vendor/magento/module-sales/Model/OrderRepository.php(108): Magento\Sales\Model\OrderRepository->setShippingAssignments(Object(Magento\Sales\Model\Order\Interceptor)) #13 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Sales\Model\OrderRepository->get('1565') #14 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Sales\Model\OrderRepository\Interceptor->___callParent('get', Array) #15 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Sales\Model\OrderRepository\Interceptor->Magento\Framework\Interception\{closure}('1565') #16 /var/www/html/bpmsport/generated/code/Magento/Sales/Model/OrderRepository/Interceptor.php(26): Magento\Sales\Model\OrderRepository\Interceptor->___callPlugins('get', Array, Array) #17 /var/www/html/bpmsport/vendor/magento/module-sales/Controller/Adminhtml/Order.php(155): Magento\Sales\Model\OrderRepository\Interceptor->get('1565') #18 /var/www/html/bpmsport/vendor/magento/module-sales/Controller/Adminhtml/Order/View.php(26): Magento\Sales\Controller\Adminhtml\Order->_initOrder() #19 /var/www/html/bpmsport/generated/code/Magento/Sales/Controller/Adminhtml/Order/View/Interceptor.php(24): Magento\Sales\Controller\Adminhtml\Order\View->execute() #20 /var/www/html/bpmsport/vendor/magento/framework/App/Action/Action.php(107): Magento\Sales\Controller\Adminhtml\Order\View\Interceptor->execute() #21 /var/www/html/bpmsport/vendor/magento/module-backend/App/AbstractAction.php(229): Magento\Framework\App\Action\Action->dispatch(Object(Magento\Framework\App\Request\Http)) #22 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Backend\App\AbstractAction->dispatch(Object(Magento\Framework\App\Request\Http)) #23 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Sales\Controller\Adminhtml\Order\View\Interceptor->___callParent('dispatch', Array) #24 /var/www/html/bpmsport/vendor/magento/module-backend/App/Action/Plugin/Authentication.php(143): Magento\Sales\Controller\Adminhtml\Order\View\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http)) #25 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(135): Magento\Backend\App\Action\Plugin\Authentication->aroundDispatch(Object(Magento\Sales\Controller\Adminhtml\Order\View\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http)) #26 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Sales\Controller\Adminhtml\Order\View\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http)) #27 /var/www/html/bpmsport/generated/code/Magento/Sales/Controller/Adminhtml/Order/View/Interceptor.php(39): Magento\Sales\Controller\Adminhtml\Order\View\Interceptor->___callPlugins('dispatch', Array, NULL) #28 /var/www/html/bpmsport/vendor/magento/framework/App/FrontController.php(55): Magento\Sales\Controller\Adminhtml\Order\View\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http)) #29 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http)) #30 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array) #31 /var/www/html/bpmsport/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http)) #32 /var/www/html/bpmsport/generated/code/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array) #33 /var/www/html/bpmsport/vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http)) #34 /var/www/html/bpmsport/generated/code/Magento/Framework/App/Http/Interceptor.php(24): Magento\Framework\App\Http->launch() #35 /var/www/html/bpmsport/vendor/magento/framework/App/Bootstrap.php(256): Magento\Framework\App\Http\Interceptor->launch() #36 /var/www/html/bpmsport/pub/index.php(37): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http\Interceptor))
Yes you can do all the data by magento migration tool which is provided by magento devdocs.
Magento Migration Docs You need to follow this link step by step and all works fine.
Beware you need to first do it in blank magento 2 no any data.